Complex sentence: In 1962 Thompson entered three John Crosthwaite designed cars in the Indianapolis 500 Unusually they used a stock V8 Buick engine and it was in the rear unlike the front engined, race tuned, Offenhauser powered cars used by most competitors.
Split into simpler sentences: In 1962 Thompson entered three John Crosthwaite designed cars in the Indianapolis 500. Unusually, they used a stock V8 Buick engine and it was in the rear unlike the front engined, race tuned, Offenhauser powered cars used by most competitors.