Question: When did Randolph Churchill's former wife help form a nonprofit organization?
Sentence (from "Pamela Harriman"): Pamela Beryl Harriman ("née" Digby; 20 March 1920 – 5 February 1997), also known as Pamela Churchill Harriman, was an English-born American socialite who was married and linked to important and powerful men.
Relevant evidence: Yes