Complex sentence: Originally starting in Blaydon, but since the creation of the A1 Western Bypass, starting at Denton Burn a suburb of Newcastle upon Tyne, it runs up the Tyne valley, by-passing the towns of Corbridge and Hexham.
Split into simpler sentences: Originally starting in Blaydon, but since the creation of the A1 Western Bypass around Newcastle upon Tyne, it now starts at Denton Burn a suburb of Newcastle upon Tyne. The road runs up the Tyne valley, bypassing the towns of Corbridge and Hexham.