Complex sentence: Prior to the recording sessions, McCartney was given a new bass, Rickenbacker 4001, which had a much beefier bass sound than the Hofner, all of the songs on the album, except for Drive My Car, was recorded using the new bass.
Split into simpler sentences: Prior to the recording sessions, McCartney was given a new bass, a Rickenbacker 4001, which had a much beefier bass sound than the Hofner. All of the songs on the album, except for "Drive My Car", was recorded using the new bass.