Complex sentence: The engine that preceded the Twin Cam appeared in the 1950 Alfa Romeo 1900 and was an under-square inline four cylinder with a cast-iron block and aluminium alloy cylinder head with double overhead cams and a 90 ° included angle between intake and exhaust valves.
Split into simpler sentences: The engine that preceded the Twin Cam appeared in the 1950 Alfa Romeo 1900. This was an under-square inline four cylinder with a cast-iron block and aluminium alloy cylinder head with double overhead cams and a 90 ° included angle between intake and exhaust valves.