Complex sentence: Donohue was considered the leading Trans-Am driver of the late 1960s and early 1970s, winning three Trans-Am championships (his last in 1971) while driving Camaros and AMC Javelins, all for Roger Penske Racing.
Split into simpler sentences: Donohue was considered the leading Trans-Am driver of the late 1960s and early 1970s. His Camaros and Javelins won three Trans-Am championships (his last in 1971) while driving Camaros and AMC Javelins, all for Roger Penske Racing.