Complex sentence: Including a cruise that they did with The Chantells only a trio was required which was Ian Heinz on (keyboard) a former member of the Echoes, Peter Curtin (drums) and Douggie Reece (bass).
Split into simpler sentences: Including a cruise that they did with The Chantells only a trio was required. In the trio were Ian Heinz on (keyboard) a former member of the Echoes, Peter Curtin (drums) and Douggie Reece (bass).