Complex sentence: He earned a B.Sc from Iowa State in 1949 and, after a tour of duty in the Navy during World War II, began graduate study in Geology at Columbia University, where he earned an M.Sc.
Split into simpler sentences: He earned a B.Sc from Iowa State in 1949. After a tour of duty in the Navy during World War II, he began graduate study in geology at Columbia University, earning an M.Sc.