Complex sentence: "Puppy Love" is a popular song written by Paul Anka in 1960 for Annette Funicello, whom he was having an affair with at the time.
Split into simpler sentences: Puppy Love is a popular song written by Paul Anka. The song was written by Anka in 1960 for Annette Funicello, whom he was having an affair with at the time.