Complex sentence: Until this switch, St. Louis had been the largest television market without a full UPN affiliate.prior to this, UPN had been seen on KPLR-TV after primetime and even earlier on ABC station KDNL-TV also after hours.
Split into simpler sentences: Until this switch, St. Louis had been the largest television market without a full UPN affiliate. Prior to channel 46 aligning with UPN, the network had been seen on KPLR-TV after primetime and even earlier on ABC station KDNL-TV also after hours.