Complex sentence: Following the war he was active in the Second Marine Division Association, serving as President of the Association 1965-66, and serving as Chairman of the 15th Annual Reunion, held in Atlantic City, New Jersey in 1964.
Split into simpler sentences: Following the war he was active in the Second Marine Division Association. He served as President of the Association 1965-66, and also served as Chairman of the 15th Annual Reunion, which was held in Atlantic City, New Jersey in 1964.