Complex sentence: It was also the last Bentley fitted with a six-cylinder engine, as its successor, the Bentley S2, used the Crewe designed and developed all-aluminium Rolls Royce 6.25-litre V8, which has remained in production in various forms ever since.
Split into simpler sentences: It was also the last Bentley fitted with a six-cylinder engine. Its successor, the Bentley S2, used the Crewe designed and developed 6.25-litre all-aluminium, Rolls-Royce_V8_engine, which has remained in production in various forms ever since.