Complex sentence: Sublette says that it was in this club that Cueva and Eliseo Grenet launched the conga as a salon dance, though it should be noted that the Lecuona Cuban Boys were playing it at the same time.
Split into simpler sentences: Sublette says that it was in this club that Cueva and Eliseo Grenet launched the conga as a salon dance. However, the Lecuona Cuban Boys were playing it at the same time.