In a small saucepan, combine brown sugar, butter and corn syrup. Bring to a boil over medium heat, stirring constantly. Cook and stir 2 minutes or until thickened. Set aside.
In a small bowl, combine apples, lemon juice, sugar and pie spice. Arrange half of the bread slices in a greased 13x9-in. baking dish. Top with apples; drizzle with half of the caramel sauce. Sprinkle with pecans; top with remaining bread.
In a large bowl, combine eggs, milk, salt and vanilla. Pour over top. Cover and refrigerate overnight. Cover and refrigerate remaining caramel sauce.
Remove strata from refrigerator 30 minutes before baking. Bake, uncovered, at 350° for 50-55 minutes or until a knife inserted in the center comes out clean. Let stand 10 minutes before cutting.
In a microwave, heat the reserved sauce. Drizzle warm sauce over strata.