Complex sentence: The engine was a 1100cc Fiat, the gearbox an inverted Fiat 600, it had pressed steel wheels and the fibreglass body was made with the advice of a local boatbuilder.
Split into simpler sentences: The engine was a 1100cc Fiat and the gearbox an inverted Fiat 600. It had pressed steel wheels and the fibreglass body was made with the advice of a local boatbuilder.