Complex sentence: For this, he was rewarded with a commission in the Regular Army and served as an officer in the 11th Infantry Regiment (United States) for the next two years, retiring in November 1863 with the rank of first lieutenant.
Split into simpler sentences: For this, he was rewarded with a commission in the Regular Army. He served as an officer in the 11th Infantry Regiment (United States) for the next two years, retiring in November 1863 with the rank of first lieutenant.