Complex sentence: All such traffic must now travel between Windsor and Eton via the Queen Elizabeth Bridge on Windsor's bypass to the west or for those approaching from Old Windsor or Runnymede the Albert Bridge provides an alternative route via Datchet's High Street.
Split into simpler sentences: All such traffic between Windsor and Eton must now travel via the Queen Elizabeth Bridge on Windsor's bypass to the west. For those approaching from Old Windsor or Runnymede, the Albert Bridge provides an alternative route via Datchet's High Street.