Complex sentence: The team eventually invades Venom, where Fox defeats the fake Andross, a false, robotic version of himself, before he returns to Corneria, leaving Andross in Venom.
Split into simpler sentences: The team eventually invades Venom, where Fox defeats Andross, only to find that it is a false, robotic version of himself. He destroys it and returns to Corneria, leaving Andross in Venom.