Complex sentence: Checking tickets and passes and issuing penalty fares is the responsibility of Metrolink's Passenger Services Representatives (PSRs), who provide security and assistance on the network; between 1992 and 2008, Greater Manchester Police had a dedicated Metrolink unit responsible for policing the system.
Split into simpler sentences: Checking tickets and passes and issuing penalty fares is the responsibility of Metrolink's Passenger Services Representatives (PSRs), who provide security and assistance on the network. Between 1992 and 2008, Greater Manchester Police had a dedicated Metrolink unit responsible for policing the system.