Complex sentence: The Sunbeam Manitou was a further development of the V-12 Maori Mk.III; work on it began by Louis Coatalen in 1917, using aluminium alloy rather than cast iron blocks, cast in blocks of three cylinders, a typical Sunbeam feature.
Split into simpler sentences: The Sunbeam Manitou was a further development of the V-12 Maori Mk.III. It used aluminium blocks rather than cast iron, cast in blocks of three cylinders, a typical Sunbeam feature.