Original sentence: An otherwise exciting performance was briefly marred by the producer unexpectedly charging IVU (sales tax) on complimentary tickets, which delayed the entry of dozens of fans.Their second full-scale concert took place August 23, 2008 at the Coliseo Roberto Clemente---- their first appearance in Puerto Rico's premiere and high-capacity concert hall
Edited sentence: Their second full-scale concert took place August 23, 2008 at the Coliseo Roberto Clemente---- their first appearance in Puerto Rico's premiere and high-capacity concert hall, a very exciting performance