Complex sentence: Denver and Seattle would play only one season, but Salt Lake would stay in the league until the end and would continue in the International Hockey League for the 1984-85 season, after the CHL ceased operations.
Split into simpler sentences: Denver and Seattle would play only one season, but Salt Lake would stay in the league until the end. In fact, they would join the International Hockey League for the 1984-85 season, after the CHL ceased operations.