John Wang Volatility and complexity have long been aspects to the Cosan (NYSE:CSAN) story that investors just have to learn to accept if they want to own the shares. None of that has gotten any easier since I last wrote about this Brazilian commodity and logistics conglomerate, though, and the shares have been hit by weaker commodity prices, adverse currency moves, and a lack of enthusiasm over the complicated and often opaque structure of the business and management's longer-term capital allocation plans. ...