Complex sentence: There was an additional event on August 19,2012 called "Rock n' Jock", a softball game with New Kids on the Block and Backstreet Boys in Harrisburg, PA.
Split into simpler sentences: There was an additional event on August 19,2012 called "Rock n'Jock". It's a softball game featuring New Kids on the Block versus Backstreet Boys in Harrisburg, PA.