Complex sentence: EDM festivals have also had considerable economic impact on their host cites; the 2014 Ultra Music Festival brought 165,000 attendees--and over $223 million--to the Miami/South Florida region's economy.
Split into simpler sentences: EDM festivals have also had considerable economic impact on their host-cites. The 2014 Ultra Music Festival brought 165,000 attendees--and over $223 million--to the Miami/South Florida region's economy.