Complex sentence: The KBBL-TV calls went into use on July 6,2006, when Equity changed the call letters of the former KWFT to KBBL-TV; at present, its Fort Smith repeater still goes by KWFT-LP.
Split into simpler sentences: The KBBL-TV calls went into use on July 6,2006, before then, the station's call letters were KWFT. At present, however, its Fort Smith repeater still goes by KWFT-LP.