Complex sentence: The major operators in the Gloucestershire area are Cotswold Green and Stagecoach West, Swanbrook, Mikes Travel, Jackies Coaches, and Wessex Bus.
Split into simpler sentences: The major operators in the Gloucestershire area are Cotswold Green and Stagecoach West. Other operators in Gloucestershire are Swanbrook, Mikes Travel, Jackies Coaches, and Wessex Bus.