|Use semicolons instead of commas in a series of involved items that
already contain commas:
The winners came from three schools: Ellington
School of the Arts, Washington, D.C.;
Wheaton High School, Wheaton,
Maryland; and Bishop Denis J. O'Connell High School,
Coordinate clauses not connected by and, but, or, nor, or for are separated by a semicolon. Use a semicolon in such a case even when a conjunctive adverb (however, moreover, nevertheless, etc.) is present:
We ate; moreover, we enjoyed it.
A semicolon goes outside a quotation mark or a closing parenthesis.
See also Adjectives and Adverbs, Punctuation of; Colon; Comma; PUNCTUATION, TYPEFACES, SERIES.