Complex sentence: HondaJet is the only aircraft which has been removed from the open-source FlightGear simulator, after in June 2014 Honda lawyers issued a takedown request in which they claimed that the use of the HondaJet model in the simulator infringes upon the Honda's trademarks.
Split into simpler sentences: HondaJet is the only aircraft which has been removed from the open-source FlightGear simulator. In June 2014 Honda lawyers issued a takedown request in which they claimed that the use of the HondaJet model in the simulator infringes upon Honda's trademarks.