Complex sentence: Sin was a professional wrestling pay-per-view (PPV) event produced by World Championship Wrestling (WCW) that replaced WCW's January PPV event, Souled Out which was held from 1997 to 2000.
Split into simpler sentences: Sin was a professional wrestling pay-per-view (PPV) event produced by World Championship Wrestling (WCW). Sint replaced WCW's January PPV event, Souled Out which was held from 1997 to 2000.