Complex sentence: He graduated from the United States Military Academy at West Point in 1832 and was commissioned a lieutenant in the 5th U. S. Infantry, and served with the 5th in the Black Hawk War in Illinois and Wisconsin.
Split into simpler sentences: He graduated from the United States Military Academy at West Point in 1832 and was commissioned a lieutenant in the 5th U. S. Infantry. He served with the 5th in the Black Hawk War in Illinois and Wisconsin.