Complex sentence: It was announced that the band would be reuniting with Allan Clarke and Graham Nash for a live performance at the induction ceremony, but the current incarnation of the band (with HOF inductees Hicks and Elliott) was unable to reschedule a performance in London to attend.
Split into simpler sentences: It was announced that the band would be reuniting with Allan Clarke and Graham Nash for a live performance at the induction ceremony. However, the current incarnation of the band (with HOF inductees Hicks and Elliott) was unable to reschedule a performance in London to attend.