Complex sentence: Winston joined the rest of the original Uglies onstage during the summer of 2005 for a number of successful shows, but in the fall of 2005 he suffered a major stroke and was unable to perform onstage again.
Split into simpler sentences: Winston joined the rest of the original Uglies onstage during the summer of 2005 for a number of very successful shows. But in the fall of 2005 he suffered a major stroke and was unable to perform onstage again.