Complex sentence: American War, assigned to the staffs of Generals Zachary Taylor, William J. Worth, and Robert Patterson, and was brevetted to first lieutenant for gallant conduct at the Battle of Monterrey.
Split into simpler sentences: American War, assigned to the staffs of Generals Zachary Taylor, William J. Worth, and Robert Patterson. He was brevetted to first lieutenant for gallant conduct at the Battle of Monterrey.