Complex sentence: Although KMOV's newscasts were critically favored, this was rarely rewarded with a ratings win over long-dominant KSDK, with the 10 p.m. newscast regularly winning at least a 20% viewership share, while KSDK averaged about a 30% share.
Split into simpler sentences: Although KMOV's newscasts won much critical acclaim, such acclaim was rarely rewarded with a ratings win over long-dominant KSDK. The 10 p.m. newscast regularly won at least a 20% share in viewership, while KSDK averaged about 30% share.