Complex sentence: In the 1920's he developed the Ascot (1928 automobile) car, had various helicopter engine patents, and in 1925 developed the Powerwheel a single cylinder rotary motor in the hub of a motorcycle wheel, including clutch and drum brakes.
Split into simpler sentences: In the 1920's he developed the Ascot car and had various helicopter engine patents. In 1925 he developed the Powerwheel, a single cylinder rotary engine in the hub of a motorcycle wheel, including clutch and drum brakes.