The casual dining chain represents the latest investment in multi-location franchises by private equity firm NRD Capital. CVS Health said on Sunday that it had agreed to buy Aetna for about $69 billion in a deal that would combine the drugstore giant with one of the biggest health insurers in the United States and has the potential to reshape the nation’s health care industry. The transaction, one of the largest of the year, reflects the increasingly blurred lines between the