Complex sentence: The episode is set in London in 1882 where it begins with Cavis Appythart and Millward Phelps--jingle writers who decide to make their big break into musical theatre.
Split into simpler sentences: The episode is set in London in 1882. It begins with Cavis Appythart and Millward Phelps--jingle writers who decide to make their big break into musical theatre.