Complex sentence: Another problem for channel 26 came from Columbia, South Carolina, where WIS-TV (channel 10) provided at least "Grade B" coverage on VHF to most of the South Carolina side of the Augusta market, and aired the full NBC schedule.
Split into simpler sentences: Another problem for channel 26 came from WIS-TV in Columbia, South Carolina (channel 10). That station provided at least "Grade B" coverage on VHF to most of the South Carolina side of the Augusta market, and aired the full NBC schedule.