Complex sentence: The Capitol Ballroom began hosting the legendary Buzz nights on Fridays, which hosted a number of national and international talent in dance music, and eventually became the U.S. 's largest weekly dance party/rave hybrid.
Split into simpler sentences: The Capitol Ballroom began hosting "Buzz" nights on Fridays, which hosted a number of national and international talent in dance music. It eventually became the country's largest weekly dance party/rave hybrid.