Complex sentence: Dree Louise Hemingway Crisman is a fashion model and daughter of Mariel Hemingway and Stephen Crisman, and the great-granddaughter of Ernest Hemingway.
Split into simpler sentences: Dree Louise Hemingway Crisman is a fashion model and daughter of Mariel Hemingway and Stephen Crisman. That makes her the great-granddaughter of Ernest Hemingway.