Complex sentence: Miller served three years of active duty in the U.S. Army, was stationed at Ft. Riley, and served as a tank platoon commander during the First Gulf War, for which he received a Bronze Star for leadership in combat.
Split into simpler sentences: Miller served three years of active duty in the U.S. Army. He was stationed at Ft. Riley, and served as a tank platoon commander during the First Gulf War, for which he received a Bronze Star for leadership in combat.