Complex sentence: During the course of the American Civil War, the town of Tallassee was never attacked by Union forces, except for one attempt by the Union Army to destroy the Tallassee Mill. The Tallassee Armory was the only Confederate one not destroyed during the American Civil War.
Split into simpler sentences: During the course of the American Civil War, the town of Tallassee never became involved with Union forces. However, there was one attempt by the Union Army to destroy the Tallassee Mill. The Tallassee Armory was the only Confederate one not destroyed during the American Civil War.