Complex sentence: Robert Fripp, Adrian Belew, Trey Gunn and Pat Mastelotto, leaving Fripp to not only be the last remaining member from any lineup prior to 1981 but the only Englishmen left as well.
Split into simpler sentences: Robert Fripp, Adrian Belew, Trey Gunn and Pat Mastelotto. Fripp was now not only the last remaining member from any lineup prior to 1981 but the only Englishmen left as well.