MJay

from https://www.bartleby.com/141/strunk.html#1

If two or more clauses, grammatically complete and not joined by a conjunction, are to form a single compound sentence, the proper mark of punctuation is a semicolon. Stevenson's romances are entertaining; they are full of exciting adventures. It is nearly half past five; we cannot reach town before dark. It is of course equally correct to write the above as two sentences each, replacing the..

Place a comma before and or but introducing an independent clause. The early records of the city have disappeared, and the story of its first years can no longer be reconstructed. The situation is perilous, but there is still one chance of escape. Sentences of this type, isolated from their context, may seem to be in need of rewriting. As they make complete sense when the comma is reached, the s..

Some Examples. Enclose parenthetic expressions between commas. Marjorie's husband, Colonel Nelson paid us a visit yesterday, The audience, which had at first been indifferent, became more and more interested. In 1769, when Napoleon was born, Corsica had but recently been acquired by France. Nether Stowey, where Coleridge wrote The Rime of the Ancient Mariner, is a few miles from Bridgewater.