Complex sentence: George Martin claimed he first heard it at the "Love Me Do" re-make session on 11 September and, in his opinion, it "badly needed pepping up" and asked the Beatles to consider making major changes to it, including increasing its tempo.
Split into simpler sentences: George Martin claimed he first heard it at the "Love Me Do" re-make session on 11 September. In opinion of George Martin, it "badly needed pepping up" and asked the Beatles to consider making major changes to it, including increasing its tempo.