Complex sentence: The deal transformed the Wranglers from a cellar-dweller to a powerhouse almost overnight, but transforming the Blitz into a lesser version of the 1983 Wranglers raised questions about the USFL's credibility--especially in Chicago.
Split into simpler sentences: The deal transformed the Wranglers from a cellar-dweller to a powerhouse almost overnight. However, trading a team that had been, at worst, the third-best unit in the league for a lesser version of the 1983 Wranglers raised questions about the USFL's credibility--especially in Chicago.