Conversation so far:
When did Frank Sinatra debut?
Frank Sinatra released his debut album, The Voice of Frank Sinatra, in 1946.
When did Frank Sinatra hit his slump?
Frank Sinatra hit his slump in 1948-1952.
What musical films was Frank Sinatra in?
Frank Sinatra starred opposite Doris Day in the musical film Young at Heart.
Did Frank Sinatra win any awards or honors for his movies?
Frank Sinatra's performance in From Here to Eternity, subsequently won an Oscar and Golden Globe Award for Best Supporting Actor.
What other films was Frank Sinatra in besides From Here to Eternity?
Frank Sinatra was in Las Vegas Nights, Take Me Out to the Ball Game, On the Town, Reveille with Beverly, Higher and Higher, Step Lively, and Anchors Aweigh.
Was Frank Sinatra in any other films besides From Here to Eternity, Las Vegas Nights, Take Me Out to the Ball Game, On the Town, Reveille with Beverly, Higher and Higher, Step Lively, and Anchors Aweigh?
Frank Sinatra starred opposite Shirley MacLaine, Maurice Chevalier and Louis Jourdan in Can-Can.

Question: When did his slump begin?
Self-contained rewrite: When did Frank Sinatra's slump begin?