Complex sentence: The car then sold to John Goss who finished 9th in the 1974 Australian Drivers' Championship before failing to start the 1974 Australian Grand Prix at Oran Park due to engine failure.
Split into simpler sentences: The car then sold to John Goss who finished 9th in the 1974 Australian Drivers' Championship. It failed to start the 1974 Australian Grand Prix at Oran Park due to engine failure.