Complex sentence: Kiki also acts as a guide to Mr. Whamsey throughout his journey in the alternate dimension, and when the latter finally returns, he bids Mr. Whamsey and the audience farewell, reminding them that he'll be waiting for them.
Split into simpler sentences: Kiki also acts as a guide to Mr. Whamsey throughout his journey in the alternate dimension. When the latter finally returns, he bids Mr. Whamsey and the audience farewell, reminding them that he'll be waiting for them.