Question: who directed the film which Oscar-winning script was written by Howard Estabrook, who's associate film producer helping adapt the screenplay, although he was uncredited for the latter?
Sentence (from "Cimarron (1931 film)"): Epic in scope, spanning forty years from 1889 to 1929, it was a critical success, although it did not recoup its production costs during its initial run in 1931.
Relevant evidence: No