Complex sentence: Williams won his only world championship race in 1971 in the 350cc Ulster Grand Prix, and also won the 1973 Isle of Man F750 TT on a monocoque-framed John Player Norton Special, in the role of team designer/rider.
Split into simpler sentences: Williams won his only world championship race in 1971 in the 350cc Ulster Grand Prix. Williams also won the 1973 Isle of Man F750 TT on a monocoque-framed John Player Norton Special, in the role of team designer/rider.