Complex sentence: According to a character in Thurber's story, the expression came from Red Barber, but according to Barber's daughter, her father did not begin using the expression until after he had read the story.
Split into simpler sentences: According to a character in Thurber's story, the expression came from Red Barber. But according to Barber's daughter, her father did not begin using the expression until after he had read the story.