Complex sentence: Clem graduated from artillery school at Fort Monroe in 1875 and was transferred to the Quartermaster Department and promoted to captain in 1882where he stayed for the rest of his career.
Split into simpler sentences: Clem graduated from artillery school at Fort Monroe in 1875 and was transferred to the Quartermaster Department and promoted to captain in 1882. He stayed in the Quartermaster Department for the rest of his career.