The Semicolon Alone Method (Coordination)

We can also join two independent clauses of equal importance by using a semicolon. Before we proceed, we should warn you that many students go "semicolon crazy" once they learn how to use one; semicolons begin to appear in the most bizarre places! There are only two legitimate uses for the semicolon: one is a sophisticated and relatively rare use in lists, and the other is between two complete thoughts. For the present, use a semicolon only if you've written one complete thought before the semicolon and one complete thought after the semicolon.

A semicolon between two complete thoughts is stronger than a comma and weaker than a period (maybe that's why it's a combination of both); it allows the two thoughts to remain in the same sentence and joins them in a grammatically correct way.

Good point guards(subject) are(verb) rare; they(subject) must possess(verb) many skills.

2. In the 1960's some high schools(subject) were divided(verb) into freaks and jocks; students(subject) who fell somewhere between the two categories were sometimes called(verb) frocks.