Complex sentence: By contrast the UK energy market is an open market in which British Gas competes with a variety of other suppliers-including Powergen (subsidiary of Germany's E.ON referred to above) and nPower (subsidiary of Germany's RWE referred to above).
Split into simpler sentences: By contrast the UK energy market is an open market in which British Gas competes with a variety of other suppliers. Including Powergen (subsidiary of Germany's E.ON referred to above) and nPower (subsidiary of Germany's RWE referred to above).