Complex sentence: It was the first non all-terrain production car equipped with 4WD and an anti-lock braking system--the Dunlop Maxaret mechanical system used hitherto only on aircraft, trucks, and racing cars.
Split into simpler sentences: It was the first non all-terrain production car equipped with 4WD and an anti-lock braking system. The Dunlop Maxaret mechanical anti-lock braking system had previously been used only on aircraft, trucks, and racing cars.