Complex sentence: The trio did not make use of external producers for any of their albums in the 1970s, nor did they ever employ session players for studio work or live performances--during concerts, Lake would play an acoustic guitar, electric guitar or bass as required.
Split into simpler sentences: The trio did not make use of external producers for any of their albums in the 1970s, nor did they employ session players for studio work or live performances. During concerts, Lake would play acoustic guitar, electric guitar or bass as required.