Complex sentence: Darlington has excellent road transport links with the North East's major trunk route the A1 (M) bypassing the town to the west which was completed in 1965 replacing the Great North Road route which is now known as the A167.
Split into simpler sentences: Darlington has excellent road transport links with the North East's major trunk route the A1 (M), which bypasses the town to the west. It was completed in 1965 replacing the Great North Road route which is now known as the A167.