Complex sentence: Graduated and appointed an Ensign in 1939 from the 67th Naval Academy Class, Sasai completed the 35th Aviation Student Course, finished his naval aviation training in November 1941 and became a fighter pilot.
Split into simpler sentences: Graduated and appointed an Ensign in 1939 from the 67th Naval Academy Class, Sasai then became a member of the 35th Aviation Student Course. He finished his naval aviation training in November 1941 and became a fighter pilot.