Complex sentence: Samuel is a former commissioner of the Australian Football League (he became a life member of the league in 1995), and was the chairman of the Melbourne and Olympic Parks Trust, which oversees both Melbourne Park and Olympic Park, Melbourne.
Split into simpler sentences: Samuel is a former commissioner of the Australian Football League (he became a life member of the league in 1995). Samuel was also was the chairman of the Melbourne and Olympic Parks Trust, which oversees both Melbourne Park and Olympic Park, Melbourne.