Complex sentence: MediaOne dropped the faux calls of "WSWF" in favor of WEVU, and replaced WEVU-LP's non-network programming with their own, thus unifying the UPN affiliates in the market.
Split into simpler sentences: MediaOne dropped the faux calls of "WSWF" and replaced it with WEVU. Outside of UPN (which is the only thing in common), MediaOne replaced WEVU's non-network programming with their own, thus unifying the UPN affiliates in the market.