Complex sentence: The models shared the 4.9 L (4887 cc/298 in³) straight-6 engine, with this being the last vehicle to use descendants of the engine originally used in the Rolls-Royce Twenty from 1922 to 1929.
Split into simpler sentences: The models shared the 4.9 L (4887 cc/298 in³) straight-6 engine. They were the last vehicles to be powered by descendants of the engine originally used in the Rolls-Royce Twenty from 1922 to 1929.