- A run-on fuses independent clauses without correct punctuation.
- Comma splices (joining clauses with only a comma) are a common form.
- Fixes: split into sentences, add a conjunction, or use a semicolon.
- Long is not the same as run-on; a long sentence can be correct.
- Reading aloud and watching for breathlessness helps spot them.
Fix run-on sentences by finding where two independent clauses are joined incorrectly — fused with no punctuation, or spliced with just a comma — and repairing each: split into separate sentences, add a coordinating conjunction, or use a semicolon. Note that a long sentence is not automatically a run-on; the issue is grammatical joining, not length. Reading aloud and noticing where you run out of breath or lose the thread surfaces them quickly.
Chapter i·Why it matters
Run-ons and comma splices confuse readers and read as unpolished, undermining otherwise good prose. Because they often come from writing the way we think — clause piling onto clause — they slip in unnoticed. Learning to recognize the independent-clause boundary and apply the right fix cleans up clarity and rhythm. Distinguishing a true run-on from a correctly built long sentence also keeps you from chopping up prose that was fine.
Chapter ii·What to include
- Identification of fused independent clauses.
- A check for comma splices specifically.
- Fixes: split, add a conjunction, or use a semicolon.
- The distinction between long and run-on.
- A read-aloud test for breathlessness.
- Sentence variety preserved, not flattened.
Chapter iii·Example
A writer finds: "She opened the door, the room was empty." Two independent clauses joined by only a comma — a splice. She fixes it three possible ways and chooses a period for punch: "She opened the door. The room was empty." Across the chapter she repairs several splices without turning every sentence short and choppy.
Chapter iv·Related questions
In WriteLoom
Three editors, in the order professionals use them
WriteLoom's Edit studio supports a focused line pass, so run-ons and splices get caught without flattening your sentence variety.
Not ready for a workspace yet? Get the free six-part series on winning the writing game: finishing drafts, editing in the right order, querying with real math, and launching on a runway.