Complex sentence: At the third Television gig on April 14,1974, Patti Smith and Lenny Kaye from the Patti Smith Group were in the audience; that band went on to make its own CBGB debut on 14 February 1975.
Split into simpler sentences: At the third Television gig on April 14,1974, Patti Smith and Lenny Kaye from the Patti Smith Group were in the audience. The band went on to make its own CBGB debut on 14 February 1975.