Complex sentence: As part of the construction of a trumpet interchange with Route 4 in East Greenwich, a new northbound Exit 7 on Route 4 was completed; the original Route 403 was accessible only from Route 4 southbound.
Split into simpler sentences: As part of the construction of a trumpet interchange with Route 4 in East Greenwich, a new northbound Exit 7 on Route 4 was completed. The old Route 403 was accessible only from Route 4 southbound.