Complex sentence: He returned to the United States Army and served from January 6,1941 until his discharge as a colonel on January 30,1946 and served as the director of Surplus Property for Division of Territories and Island Possessions, Department of Interior.
Split into simpler sentences: He returned to the United States Army and served from January 6,1941 until his discharge as a colonel on January 30,1946. He then served as the director of Surplus Property for Division of Territories and Island Possessions, Department of Interior.