OLDWICK, N.J.–(BUSINESS WIRE)–A.M. Best has commented that the Credit Ratings (ratings) of Shenandoah Life Insurance Company (Roanoke, VA), SBLI USA Life Insurance Company, Inc. (New York, NY) and S.USA Life Insurance Company, Inc. (Phoenix, AZ) (collectively referred to as Prosperity Life Group) remain unchanged following the recently announced sale of the companies. Prosperity Life Group’s current majority shareholders, including funds managed by Reservoir Capital Group, LLC and Black Diamo