Complex sentence: He had basic training at Fort Polk, Louisiana and served as an infantry sergeant in F Company, 2nd Battalion, 179th Infantry Regiment, 45th Infantry Division in Korea, from December 1951 to August 1952.
Split into simpler sentences: He had basic training at Fort Polk, Louisiana. He served as an infantry sergeant in F Company, 2nd Battalion, 179th Infantry Regiment, 45th Infantry Division in Korea, from December 1951 to August 1952.