Complex sentence: It was originally hosted by a downtown advocacy group, A Better Fort, who shut down the 800th block of South Calhoun Street (So-Cal) on the opening night of the Three Rivers Festival.
Split into simpler sentences: It was originally hosted by a downtown advocacy group, A Better Fort. The group shut down the 800th block of South Calhoun Street (So-Cal) on the opening night of the Three Rivers Festival.