Complex sentence: This convention honors 65 consecutive years of public performance by the Four Freshmen--and the convention is on the site of the former "113 Club" where the Freshmen played their first professional gig on September 20,1948.
Split into simpler sentences: This convention honors 65 consecutive years of public performance by the Four Freshmen. The convention is on the site of the former "113 Club" where the Freshmen played their first professional gig on September 20,1948.