Complex sentence: Originally the flight was planned to have a fuel stop at the city of Cobija, on Bolivia's border with Brazil, but the flight's late departure meant the aircraft would not arrive at Cobija prior to the airport's closing time.
Split into simpler sentences: Originally the flight was planned to have a fuel stop at the city of Cobija, on Bolivia's border with Brazil. But the flight's late departure meant the aircraft would not arrive at Cobija prior to the airport's closing time.