Brown pork sausage in a large skillet, stirring until it crumbles. Drain sausage on paper towels. Discard drippings.
Cook celery and onion in butter in large skillet over medium-high heat, stirring constantly, until tender. Add chopped pear and garlic; cook, stirring constantly, until pear is tender. Remove pear mixture from heat.
Place French bread cubes in a large bowl. Stir in sausage, pear mixture, sweet pepper, and next 3 ingredients. Add broth, stirring gently. Spoon into a lightly greased 13- x 9- x 2-inch baking dish. Bake, uncovered, at 350° for 40 minutes.