Complex sentence: During the fifth season, Laurie returned for Thanksgiving and was mentioned to be now living in Chicago and after accidentally letting it slip she hadn't changed her promiscuous ways, she lost her spot as the favorite child.
Split into simpler sentences: During the fifth season, Laurie returned for Thanksgiving and was revealed to be now living in Chicago. After accidentally letting it slip that she hadn't changed her promiscuous ways, she lost her spot as the favorite child.