Complex sentence: John Lennon felt that this song, among others on the album, was directed at him; in particular, he perceived the protagonists who sing "We believe that we can't be wrong" to be himself and Yoko Ono.
Split into simpler sentences: John Lennon felt that this song, among others on the album, was directed at him. In particular, the protagonists who sing "we believe that we can't be wrong" are believed to be himself and Yoko Ono.