Complex sentence: Beginning in the late 1960s, Pepper became a pioneer of fusion jazz, his band The Free Spirits (active between 1965 and 1968, with guitarist Larry Coryell) being credited as the first to combine elements of jazz and rock.
Split into simpler sentences: Beginning in the late 1960s, Pepper became a pioneer of fusion jazz. His band, The Free Spirits, (active between 1965 and 1968, with guitarist Larry Coryell) is credited as the first to combine elements of jazz and rock.