Complex sentence: In 1999, WWIN changed its call letters to WBVT and in May of that year, WB programming moved to WFFF and WBVT picked up UPN from WWBI-LP.
Split into simpler sentences: In 1999, WWIN changed its call letters to WBVT. In May of that year, WB programming moved to WFFF-TV and WBVT picked up UPN from WWBI-LP.