Complex sentence: In the summer of 2010, Michael McDonald toured with Donald Fagen and Boz Scaggs, performing together as one band billed as The Dukes of September Rhythm Revue.
Split into simpler sentences: In the summer of 2010, Michael McDonald began a tour with Donald Fagen and Boz Scaggs. They are performing together as one band billed as The Dukes of September Rhythm Revue.