Complex sentence: WIBV became WSDZ, when WIBV transfered all of its programming to KSD-AM, which became KTRS in early-1997, and is currently the Radio Disney affiliate for the greater St. Louis Metropolitan area.
Split into simpler sentences: WIBV became WSDZ, when it transfered all of its programming over to KSD-AM, which became KTRS in early-1997. Since then, it has been the Radio Disney affiliate for the Greater St. Louis Metropolitan area.