Complex sentence: He was a 1950 graduate of the United States Military Academy (where he later served as a social sciences instructor, 1956 to 1960), held Master's Degrees in economics and in government from Harvard University and was a 1967 graduate of the National War College.
Split into simpler sentences: He was a 1950 graduate of the United States Military Academy (where he later served as a social sciences instructor, 1956 to 1960). He received Master's Degrees in economics and in government from Harvard University and was a 1967 graduate of the National War College.