Citrus Glazed Chicken

4 (4 ounce) boneless, skinless chicken breasts 3 tablespoons orange juice concentrate, thawed 2 tablespoons fresh lemon juice 1/2 cup chicken broth 3 tablespoons Splenda® No Calorie Sweetener, Granulated 1 1/2 teaspoons cornstarch 1 tablespoon unsalted butter 1 tablespoon chopped...