Semicolons

1.   In a complex list

The garden showcased red, yellow, and white roses; elm, oak, and maple trees; and tall, medium, and short shrubs.

NOTE: The "major" list is: roses, trees, and shrubs.  Each of these has a type of "sublist."  Without the semicolon, it would be difficult to distinguish the major list from the sublist. 

2.  To join two related sentences

The final guest left at 4 a.m.; I thought the party would never end!
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Marcia Veatch
Iowa City, Iowa