Complex sentence: From there it briefly becomes a four-lane, 4.5 km (2.8 miles) expressway north from Highway 401 to Hamilton Road, where it continues as a four-lane arterial street through the rest of London.
Split into simpler sentences: From there it briefly becomes a four-lane, 4.5 km (2.8 miles) expressway north from Highway 401 to Hamilton Road. It then continues north as a four-lane arterial street through the rest of London.