Complex sentence: At Smithland, Kentucky, it joined General Ulysses Grant for the movement upon Fort Henry, was present at the capture of that place, then moved to Fort Donelson, where it took part in the fight and assault which resulted in victory.
Split into simpler sentences: At Smithland, Kentucky, it joined General Ulysses Grant for the movement upon Fort Henry, was present at the capture of the Fort. It then moved to Fort Donelson, where it took part in the fight and assault which resulted in victory.