Complex sentence: The company's cash flow had decreased by over 120 million dollars annually during the Shapiro years and in October 2008, Six Flags was warned its stock value had fallen below the required minimums to remain listed on the New York Stock Exchange.
Split into simpler sentences: The company's cash flow had decreased by over $120 annually during the Shapiro years. In October 2008, Six Flags was warned its stock value had fallen below the required minimums to remain listed on the New York Stock Exchange.