Complex sentence: Crockett had been promoting shows under the title of Georgia Championship Wrestling (and later World Championship Wrestling) that aired on Turner's TBS supersight of financial woes within the company, Turner purchased it in order to retain one of the highest rated shows on his network.
Split into simpler sentences: Crockett had been promoting shows under the title of Georgia Championship Wrestling (and later World Championship Wrestling) that aired on Turner's TBS superstation. In light of financial woes within the company, Turner purchased it in order to retain one of the highest rated shows on his network.