Complex sentence: The boom caused by Concorde generated substantial public opposition in the United States and eventually in other countries around the world under routes the aircraft was supposed to fly, and made it impossible for Concorde to be a commercial success.
Split into simpler sentences: The boom caused by Concorde generated substantial public opposition in the United States and eventually in other countries around the world with airspace the aircraft was supposed to fly through. This opposition made it impossible for Concorde to be a commercial success.