Joel Greenblatt is known both for running a hedge fund with an incredibly strong track record, nearly 40% average yearly returns over two decades, and for popularizing his value approach among individual investors with best sellers You Can Be A Stock Market Genius and The Little Book That Beats The Market. But after all that success, he’s changing the way he runs his funds to make the ups and downs easier for people to swallow. “With the concentrated hedge fund strategy we made very high returns over a long period of time and I was okay with the volatility because…