San Francisco-based Apple American Group acquired Southern Bells Inc., a franchise group of 76 restaurants — mostly Taco Bell but also some KFC and Pizza Hut units — in Indiana, Illinois and Kentucky. Terms of the deal, which closed Dec. 17, were not released. The acquisition will bring about $97 million in revenue to the company, raising its annual systemwide revenues to about $1.25 billion and making it one of the largest franchise operations in the U.S.