Complex sentence: After KOMO-TV (channel 4) signed on in December 1953, Seattle's channel 7 is the last commercial VHF channel allocation available in the Puget Sound area and its construction permit was heavily contested among several local broadcast interests.
Split into simpler sentences: After KOMO-TV (channel 4) signed on in December 1953, Seattle's channel 7 was the last commercial VHF channel allocation available in the Puget Sound area. As such, its construction permit was heavily contested among several local broadcast interests.