Complex sentence: From 1935-1937, he was attached to the IJA 12th Infantry Regiment, and became commander of the IJA 78th Infantry Regiment in 1938, after his promotion to rikugun taisa (equivalent to colonel) the previous year.
Split into simpler sentences: From 1935-1937, he was attached to the IJA 12th Infantry Regiment. He became commander of the IJA 78th Infantry Regiment in 1938, after his promotion to colonel the previous year.