Complex sentence: Molland had started a band in 1975 with Colosseum's Mark Clarke and Humble Pie's Jerry Shirley, called "Natural Gas", performing a few concerts as the opening act for Peter Frampton in 1976.
Split into simpler sentences: Molland had started a band in 1975 with Colosseum's Mark Clarke and Humble Pie's Jerry Shirley using the moniker Natural Gas. They performed a few concerts as the opening act for Peter Frampton in 1976.