Complex sentence: A PERTIS passenger-operated ticket machine, issuing'Permits to Travel'-which are exchanged on-train or at manned stations for travel tickets-is located on the Ashford-bound platform, by the footbridge.
Split into simpler sentences: A PERTIS passenger-operated ticket machine issues'Permit to Travel' tickets which are exchanged on-train or at manned stations for travel tickets. This is located on the Ashford-bound platform, by the footbridge.