The unit of publication moved and nobody announced it
You still write pages. You still publish pages. Your content management system is organised around pages, your navigation lists pages, and your review process, if you have one, reviews pages. None of that has changed. What changed is that the page is now mostly a container, and the thing that actually reaches a reader is a fragment of it.
Count the ways a paragraph of yours travels without the rest of the page. It appears as an excerpt under a search result. Somebody copies it into a message to a colleague and asks whether it is still true. It is quoted back at you in a complaint. It is screenshotted. It is pulled out and shown as the source underneath an answer somewhere. In every one of those cases, the reader sees the paragraph and does not see the page.
This is not a new problem and it is not a machine problem. It is the old problem of writing reference material that gets skimmed, made sharper. Somebody landing on your returns page and scrolling to the heading that matches their question has always been reading one section alone. The difference now is only that the fragment travels further and arrives with less around it.
The first sentence of a section has to name its own subject
Open any policy page and read the first sentence under each heading. A large share of them will begin with a word that points somewhere else. This applies from the date of booking. It must be requested in writing. These are counted from the day the goods arrive. Each of those is a perfectly good sentence in place and an empty one out of place, because the noun it is about is sitting in the heading, or in the paragraph above, or in the page title.
The rule is simple to state and slightly uncomfortable to apply. The first sentence of every section names the thing the section is about, in full, using the word a stranger would use. Not it, not this, not the above. The deposit is refundable until seven days before the booking date. A cancellation must be requested in writing. The fourteen day return period is counted from the day the goods arrive.
The discomfort is that this reads slightly formal and slightly repetitive when you read the page from top to bottom, which is how you read it and how almost nobody else does. Writers resist it for that reason, and the resistance is aesthetic rather than practical. You are optimising the reading experience of the one person who will read the whole page, at the cost of everybody who will read one part of it.
Pronouns are the most expensive words on the page
A pronoun is a promise that the reader is holding something in their head from a moment ago. Inside a paragraph that promise is safe, because the antecedent came a line or two earlier and travels with the pronoun. Across a paragraph break it is a gamble, and across a section break it is simply broken.
So set a boundary and keep it: no pronoun may reach backwards past the start of its own paragraph. If the paragraph opens with it, they, this, these, that or such, the paragraph has borrowed a noun it does not own. Replace the pronoun with the noun. Repeat the noun as many times as the section needs it.
The words that hide from this rule are the ones that do not look like pronouns. The above. The latter. Said policy. As described. The former arrangement. This category. Each of these is a pointer with no target once the paragraph is alone, and each of them survives editing because it reads like professional writing rather than like a bug. Search for them by name when you edit. They are easier to find than to notice.
Relative time is a lie the moment it travels
Currently. Recently. From next month. As of this year. Our new pricing. Until further notice. Every one of these is anchored to the moment of writing, and the reader cannot see that moment. A fragment saying prices will rise next month is meaningless when it is read, and worse than meaningless when it is read a year later and believed.
The fix is to write times as facts rather than as offsets. Name the date. Name the version. Name the season by its year. Where you genuinely cannot, because the thing does change and you do not want to maintain a date, then say who to check with rather than implying currency you are not maintaining.
There is a second family of the same problem: words that describe change rather than state. We have updated our policy. This has been simplified. The old process no longer applies. These sentences make sense only to a reader who knew the previous state, which is a shrinking group that eventually reaches nobody. Announce a change in an announcement, which is dated and disposable, and describe the current state in the reference page, which is not.
A heading is not a safe place to keep a qualifier
Headings do useful work. They scope the passage under them and they signal what it answers. What they cannot be relied on to do is travel with the passage, because a fragment lifted from the middle of a section frequently arrives with the surrounding text and without the heading above it.
That has one specific consequence, and it is the one people get wrong. Never let a heading carry a qualifier that the sentences underneath depend on. A heading reading Business accounts, followed by a paragraph saying the limit is ten users, produces a paragraph that states a false limit for everybody else. The qualifier belongs inside the sentence: business accounts are limited to ten users.
This looks like it contradicts the advice to write specific headings. It does not. Write specific headings, and then write the sentences underneath as though the heading were not there. The heading is for the person scanning the page. The sentence is for everybody else, including the person scanning the page, who is going to read the sentence anyway.
Breaking the dependency chain
Two structures reliably produce paragraphs that cannot stand alone. The first is the numbered process, where step four assumes you did steps one to three and, crucially, assumes you are the kind of customer the process is for. Somebody who arrives at step four alone is being told to do something without being told whether it applies to them.
The second is the rule followed by its exception. A paragraph states the rule. The next paragraph carves out the case where it does not hold. Read together, correct. Read apart, the first paragraph is a false absolute and the second is an exception to nothing. This structure is everywhere in policy writing because it is how policies are drafted, and it is the single most common way a correct document produces a wrong answer.
Both are fixed the same way, by making each paragraph carry the condition it depends on in a subordinate clause. Where the goods were bought online, you have fourteen days. Where the goods were made to order, there is no return period. Two paragraphs, each true alone, each slightly longer, no exception left dangling. The cost is a little repetition. The alternative is a document that is only correct when read in full, which is a document that is only correct in theory.
A test that takes two minutes
Open your most important reference page. Pick three paragraphs from the middle of it, without choosing, and paste each one into an empty document on its own. Read them cold. For each, answer two questions: what is this about, and who does it apply to. If either answer requires you to remember the page it came from, that paragraph fails.
The better version of the test is to hand those three paragraphs to somebody who did not write the page and ask the same two questions. You cannot reliably run this test on your own writing, because you are carrying the whole page in your head and you will supply the missing subject without noticing. This is the same reason writers cannot proofread their own work, and it has the same fix.
Do it once and you will find one or two failures. Do it on a second page and you will start to see which of your habits produces them, because everybody has a favourite. Some writers lean on pronouns. Some hide conditions in headings. Some open every section with a connective. Knowing which one is yours is worth more than the individual fixes, because it changes the next thing you write rather than the last thing.
What this costs, and where it does not apply
Be honest about the cost. Writing this way makes prose flatter. Connective tissue is what makes an argument feel like an argument, and stripping it out leaves reference material that reads like reference material. Nouns get repeated. Sentences get slightly longer because they are carrying their own conditions. A good editor would mark half of it.
That trade is right for reference material and wrong for everything else. A policy page, a help article, a specification, a set of instructions, an FAQ: write these so that any paragraph can be lifted out. An essay, a case study, a founder letter, a piece of argument like this one: do not. Those are read in order by people who chose to read them, and stripping the connectives out of an argument does not make it robust, it makes it dull and harder to follow.
The boundary is whether the reader arrived wanting the whole thing or wanting one fact out of it. Almost nobody wants the whole returns policy. Write accordingly, and keep your good sentences for the pages somebody chose to read.