Complex sentence: In August 2009, Silver Fly signed a joint flight service agreement with Riau Airlines for Riau to operate services to Indonesia between Ipoh and Medan, using a Fokker 50 aircraft.
Split into simpler sentences: In August 2009, Silver Fly signed a joint flight service agreement with Riau Airlines. They worked with Riau Airlines for a flight to Indonesia between Ipoh and Medan, using a Fokker 50 aircraft.