Conversation so far:
What did Paddy Chayefsky do after World War II?
Returning to the United States, Paddy Chayefsky worked in his uncle's print shop, Regal Press.
What did Paddy Chayefsky do in his uncle's print shop, Regal Press?
Paddy Chayefsky worked in his uncle's print shop, which provided a background for his later teleplay, Printer's Measure, and his story for the movie As Young as You Feel.

Question: How did it provide a background?
Self-contained rewrite: How did working at his uncle's print shop provide a background for Paddy Chayefsky's later teleplay, Printer's Measure, and his story for the movie As Young as You Feel?