Complex sentence: In the later episode, "Meet the Quagmires", Peter goes back to the time when he was dating Lois, but loses his chance to kiss Lois, prompting Lois to marry Quagmire instead.
Split into simpler sentences: In the later episode, "Meet the Quagmires", Peter goes back to the time when he was dating Lois. He loses his chance to kiss her, prompting Lois to marry Quagmire instead.