Kraft Heinz was created via the Warren Buffett-aided merger of Kraft and Heinz, but now, the company is looking to split apart again.Kraft Heinz (KHC 1.17%) is planning on becoming two businesses, which is a somewhat shocking end to what has been an interesting saga. At least one prominent investor isn't pleased with this decision, though.That investor, Warren Buffett, is the CEO of Berkshire Hathaway (BRK.A -1.28%) (BRK.B -1.40%), which happens to be Kraft Heinz's largest shareholder, and his opinion is a ...