Complex sentence: Despite this he had a successful racing career with Rudge, Sunbeam and Norton, winning the Ulster Grand Prix on a Rudge Ulster in 1928, the first road race win with an average of 80 mph.
Split into simpler sentences: Despite this he had a successful racing career with Rudge, Sunbeam and Norton. Road successes included winning the Ulster Grand Prix on a Rudge Ulster in 1928, the first road race win with an average of 80 mph.