Complex sentence: Initially dubbed the "Grey" motor alluding to the colour of the cylinder block, later iterations came in the form of a "Red", "Blue", "Black" and the four-cylinder "Startfire" engine.
Split into simpler sentences: Initially dubbed the "Grey" motor alluding to the colour of the cylinder block. Later iterations came in the form of a "Red", "Blue", "Black" and the four-cylinder "Startfire" engine.