Run-on sentence
A run-on sentence is two or more independent clauses joined without proper punctuation, making the sentence long and hard to parse.
Also known as:
Fused sentence
What is run-on sentence?
A run-on sentence is what you get when two complete sentences are pushed together without a period, a conjunction or any punctuation strong enough to separate them. The classic form is the fused sentence, where no mark divides the clauses at all: "The feature shipped the team celebrated." The comma splice is its close cousin, using a single comma in place of the missing punctuation. Run-ons usually happen when a writer has too many ideas competing for one sentence.
Run-on: The feature shipped the team celebrated.
Fixed with period: The feature shipped. The team celebrated.
Fixed with conjunction: The feature shipped, and the team celebrated.
Why does run-on sentence matter?
Run-ons slow readers down because they have to find the sentence boundary themselves. In brand writing, that friction shows up as a lower completion rate on a blog post or a reader bouncing off a landing page before reaching the call to action. Clear sentence boundaries let pacing do its job, keeping the reader moving from idea to idea without stumbling.
How do you use run-on sentence?
Read each sentence and check whether you could split it at a natural break without losing meaning. If yes, you probably had a run-on.
Break run-ons with a period whenever possible, since that is the cleanest fix and works for almost every brand voice.
Use a conjunction only when the two ideas genuinely belong together and a period would make them feel disconnected.
