Complex sentence: The eastern end of the road is at Bromham on the outskirts of Bedford as a branch off the A428, its route then crosses into the Borough of Milton Keynes (and traditional Buckinghamshire).
Split into simpler sentences: The eastern end of the road is at Bromham on the outskirts of Bedford as a branch off the A428. Its route then crosses into the Borough of Milton Keynes (and traditional Buckinghamshire).