Complex sentence: With the added weight of the bombs and armour, bigger brake discs were fitted to the main wheels; at first this only applied to "Bombphoons" but eventually all Typhoons used these brakes.
Split into simpler sentences: With the added weight of the bombs and armour, bigger brake discs were fitted to the main wheels. At first this only applied to "Bombphoons", but eventually all Typhoons used these brakes.