Complex sentence: These, however, played in an earlier style, and the young Flanagan and his friends were more interested in the newer bebop, including that played by pianist Bud Powell, who had a strong effect on Flanagan's musical thinking and improvising.
Split into simpler sentences: These, however, played in an earlier style, and the young Flanagan and his friends were more interested in the newer bebop. A bigger influence was therefore bebop pianist Bud Powell, who had a strong effect on Flanagan's musical thinking and improvising.