Complex sentence: AUSCAR's were also restricted to running 5.0 litre Holden and Ford V8 engines, though initially the Ford XF Falcon's used the 5.8L 351 Cleveland V8 engines, but subsequent Falcons would run the 5.0L V8.
Split into simpler sentences: AUSCAR's were also restricted to running 5.0 litre Holden and Ford V8 engines. Initially the Ford XF Falcon's were running the 5.8L 351 Cleveland V8 engines, but subsequent Falcons would run the 5.0L V8.