Complex sentence: The Mello-Kings were a doo-wop group who became popular in the late 1950s, despite the fact that their only hit, "Tonite Tonite" (1957), never climbed higher than number 77 in the US charts.
Split into simpler sentences: The Mello-Kings were a doo-wop group who became popular in the late 1950s. Despite the fact that their only hit, "Tonite Tonite" (1957), never climbed higher than number 77 in the US charts.