Complex sentence: The plan for the film adaptation of Lawrence's novel came from Silvio Narizzano, who had directed the successful "Georgy Girl" (1966), who suggested his idea to Larry Kramer, who then bought the book's film rights.
Split into simpler sentences: The plan for the film adaptation of Lawrence's novel came from Silvio Narizzano, who had directed the successful "Georgy Girl" (1966). He suggested the idea to Larry Kramer, who then bought the book's film rights.