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 still very useful.

Identifying and correcting run-on sentences

A comma splice is the result of two independent clauses joined only by a comma. This type of error can be resolved with the addition of a coordinating conjunction like and or but after the comma, a semicolon in place of the comma, or a period

Identfying and correcting comma splices

More on comma splices: suggests using a subordinating conjunction like until or because to link the two independent clauses  in place of the comma

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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