1) When each item in a series includes commas, a semicolon is used
to separate the items.
- The pilots were delighted that the owners approved the new contract, the one with the pay increase; accepted changes to the benefits package, changes that included vision care; and allowed pilots to fly small commuter jets.
2) The semicolon may be used to separate closely related independent clauses that are not connected by conjunctions.
- The sun shone all day; it was a welcome sight.
3) Hence, however, indeed, moreover, still, therefore, thus are conjunctive adverbs. They belong to the second sentence
and are not coordinating conjunctions. When used after a semicolon
they are followed by commas.
- Steve found it difficult to take advice; however, Bill found it easy to give.