Complex sentence: The Helpseeker returns them to the restaurant, just in time for the Friday night show, but Robert has stowed away on their trip back and attacks Sir Frederick, mistaking him for George; a final showdown with Robert sends him back to his own time.
Split into simpler sentences: The Helpseeker returns them to the restaurant, just in time for the Friday night show, but Robert has stowed away on their trip back and attacks Sir Frederick, mistaking him for George. A final showdown with Robert sends him back to his own time.