A run-on sentence is not simply a sentence that is too long. Both run-ons and comma splices involve incorrect punctuation (or lack of punctuation) between complete thoughts.

Identifying and correcting run-on sentences and comma splices: this very basic, very old site is very useful.

How to correct run-on sentences

Correcting comma splices

A fragment is an incomplete thought that lacks a subject, a main verb, or both.

Identifying and correcting fragments

Types of fragments

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