Complex sentence: The CB900F uses a four-cylinder DOHC engine, essentially the same as in the Honda CB900C, and sharing many components with the Honda CB750 engine, differing mainly in a square bore x stroke.
Split into simpler sentences: The CB900F uses a four-cylinder DOHC engine, essentially the same as in the Honda CB900C. It shares many components with the Honda CB750 engine, but has a square bore x stroke.