Original sentence: He also belonged to several clubs, including the Langham (until 1898), the Savage, and perhaps most notably, the London Sketch Club (of which he was a President 1903-4.John Hassall was the father of poet Christopher Hassall and the printmaker and OBE Joan Hassall
Edited sentence: He also belonged to several clubs, including the Langham (until 1898), the Savage, and perhaps most notably, the London Sketch Club (of which he was a President 1903-4).John Hassall was the father of poet Christopher Hassall and the printmaker Joan Hassall,  OBE