Complex sentence: Largely designed by Walter Gordon Wilson, its 35.8 litre V12 air-cooled engine was designed by Armstrong Siddeley, and it also incorporated a new hydraulic braking system which had to be specially developed due to its weight and speed.
Split into simpler sentences: Largely designed by Walter Gordon Wilson, its 35.8 litre V12 air-cooled engine was designed by Armstrong Siddeley. It also incorporated a new hydraulic braking system which had to be specially developed due to its weight and speed.