Complex sentence: He announces that he has a girlfriend, Gloria Upson (Joanna Barnes), and wants to bring her over to meet Mame, but he cautions Mame to act responsibly while Gloria is there.
Split into simpler sentences: He announces that he has a girlfriend, Gloria Upson (Joanna Barnes), and wants to bring her over to meet Mame. He cautions Mame to act responsibly while Gloria is there.