Complex sentence: Craig Gannon was a member from 1983 to 1984, while guitarist Malcolm Ross (formerly of Josef K and Orange Juice) joined the band in 1984 and played on the "Knife" album.
Split into simpler sentences: Craig Gannon was a member from 1983 to 1984. Guitarist Malcolm Ross (formerly of Josef K and Orange Juice) joined the band in 1984, and played on the "Knife" album.