Complex sentence: Overall width increased by due to the addition of larger wheel arches added to clear wider tires, which were 185/70 VR14s at the front and 205/70 VR14s at the rear.
Split into simpler sentences: Overall width increased by due to the addition of larger wheel arches added to clear wider tires. The tires were 185/70 VR14s at the front and 205/70 VR14s at the rear.