Complex sentence: Gen. J. H. Hobart Ward, III Corps of the Army of the Potomac, was at the Battle of Fredericksburg, but they were held in reserve and escaped the terrible bloodshed of the Union defeat.
Split into simpler sentences: Gen. J. H. Hobart Ward, III Corps of the Army of the Potomac, was at the Battle of Fredericksburg. They were held in reserve and escaped the terrible bloodshed of the Union defeat.