With interest rates still at super-low levels, executives at LifePoint Hospitals have decided to simplify their financial structure a bit by amending their credit package with a group of lenders led by Bank of America. The deal lets the Brentwood-based company issue another $325 million in term loans. The plan is to use about $225 million of that next week to redeem 3.25 percent convertible notes due in 2025.