Complex sentence: A similar engine is the Bristol Hydra although this engine had 16 aligned cylinders, forming an octagon, further similar engines are the Armstrong Siddeley Hyena and the much larger Armstrong Siddeley Deerhound.
Split into simpler sentences: A similar engine is the Bristol Hydra although this engine had 16 aligned cylinders, forming an octagon. Further similar engines are the Armstrong Siddeley Hyena and the much larger Armstrong Siddeley Deerhound.