The semicolon or semicolon is a punctuation mark that separates major sentence elements. A semicolon can be used between two closely related independent clauses, and can also be used in place of commas to separate items in a list. Use a semicolon before such words and terms as namely, however, therefore, that is, i.e., for example, e.g., for instance, etc., when they introduce a complete sentence. The sentence should have the semicolon in the following way:
The illustrator drew his characters in pencil, then layered in more detail; ultimately he painted each comic strip in watercolor.
