Complex sentence: The last ever passenger train was a'special' service from Chepstow to Ross-on-Wye along both the Wye Valley and Ross and Monmouth Railways, the only known train to make the trip in one single journey.
Split into simpler sentences: The last ever passenger train was a'special' service, it ran from Chepstow to Ross-on-Wye along both the Wye Valley Railway and the Ross and Monmouth Railway. It was the only known train to make the trip in one single journey.