Complex sentence: The second time you catch up with DoodleBob and defeat him, the trion will get back Squidward's clarinet, but while their backs are turned, Doodlebob will escape in a rocket.
Split into simpler sentences: The second time you catch up with DoodleBob and defeat him. They will get back Squidward's clarinet, but while their backs are turned, Doodlebob will escape in a rocket.