Complex sentence: Max stops by Roxanne's house to call off their date, but when Roxanne says she will just have to go with someone else, Max instead fabricates a story about his father knowing Powerline, and that he will be on stage at the concert with Powerline.
Split into simpler sentences: Max stops by Roxanne's house to call off their date, but when Roxanne says she will just have to go with someone else, Max instead fabricates a story about his father knowing Powerline. He tells her that he will be on stage at the concert with Powerline.