Question: What year did Larry McMurtry's screenplay adaptation about the complex emotional and homosexual relationship between Ennis Del Mar and Jack Twist in the American West from 1963 to 1983 win him an oscar?
Sentence (from "Brokeback Mountain"): Adapted from the 1997 short story of the same name by Annie Proulx, the screenplay was written by Ossana and Larry McMurtry.
Relevant evidence: No