Complex sentence: Glanville married Millient Carr on 20 June 1930 by whom he had a daughter and a son, the latter would follow in his father's footsteps and become a civil engineer.
Split into simpler sentences: Glanville married Millient Carr on 20 June 1930 by whom he had a daughter and a son. The latter would follow in his father's footsteps and become a civil engineer.