Complex sentence: The Timex Social Club was an American contemporary R&B group, formed in 1982 and best known for the 1986 hit single, "Rumors" and for being creators of the new jack swing movement.
Split into simpler sentences: The Timex Social Club was an American contemporary R&B group, formed in 1982. The group is perhaps best known for its 1986 hit single, "Rumors" and for being major forerunners of the new jack swing movement.