Complex sentence: But her father, a rundown, drunken singer, in no way fits the image Christie had of him, and in her disappointment she leaves and calls the only man she still believes in, Gavin.
Split into simpler sentences: But her father is now a rundown, drunken singer, and in no way fits the image Christie had of him. In her disappointment, she leaves and calls the only man she still believes in, Gavin.