Complex sentence: McCartney mentioned in the 1989 radio series "McCartney on McCartney" that the vocals were meant to have a Beach Boys sound; he has also said that he was trying to sing it in the style of Marianne Faithfull.
Split into simpler sentences: McCartney mentioned in the 1989 radio series "McCartney on McCartney" that the vocals were meant to have a Beach Boys sound. He has also said that he was trying to sing it in the style of Marianne Faithfull.