Complex sentence: The song has traditionally received a varied response from music critics, some of whom find it lacklustre and pretentious, while others admire its musical authenticity and consider the message to be the most meaningful on "Sgt. Pepper".
Split into simpler sentences: The song has traditionally received a varied response from music critics. Some find it lacklustre and pretentious, while others view it as a work of musical authenticity and consider its message to be the most meaningful on "Sgt. Pepper".