Complex sentence: The first concert in 2011 featured Edgar Froese and Tangerine Dream, along with Brian May, and the second concert in 2014 featured Rick Wakeman and his band, accompanied by May.
Split into simpler sentences: The first concert in 2011 featured Edgar Froese and Tangerine Dream, along with Brian May. The second concert in 2014 featured Rick Wakeman and his band, accompanied by May.