George Soros, the billionaire financier, is handing more control of his money management firm to two of his sons as he continues to scale back the focus of his investment firm. Late Monday, Mr. Soros disclosed that he was promoting one son, Jonathan, to be a deputy chairman of the firm, Soros Fund Management, sharing the title with another son, Robert, who was named chief investment officer last month. Mr. Soros remains chairman of the firm, which manages $12.8 billion. The two sons will oversee the investment business day to day. At the same time, Mr. Soros is spinning off...