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Avoiding Run-on Sentences
The length of a sentence has nothing to do with whether or not a sentence is considered a run-on. An over-exuberant, run-off-at-the-mouth, 400-word gorilla of a sentence can be structurally fine. A run-on sentence is one in which two clauses have been connected incorrectly.
Use Commas, Clauses, and Semicolons