Complex sentence: Williamson's harmonica style was a great influence on post-War performers, and later in his career he was a mentor to many of up-and-coming blues musicians who moved to Chicago, including Muddy Waters.
Split into simpler sentences: Williamson's harmonica style was a great influence on postwar performers. Later in his career he was a mentor to many up-and-coming blues musicians who moved to Chicago, including Muddy Waters.