Complex sentence: The street festival is hosted on Copley Square, and usually includes a live music stage, dozens of exhibitors and vendors, and many free participatory activities for attendees and their families--programming and activities for children, writing workshops and contests, and open mic opportunities.
Split into simpler sentences: The street festival is hosted on Copley Square, and usually includes a live music stage, dozens of exhibitors and vendors, and many free participatory activities for attendees and their families. This includes programming and activities for children, writing workshops and contests, and open mic opportunities.