Gumbo with chicken

3 large boneless skinless chicken breast halves salt and pepper 1/4 cup vegetable oil 1 lb smoked sausage , cut into 1/4-inch slices 1/2 cup all-purpose flour[...]

2 -3 tablespoons olive oil 1 medium onion , diced 1 large celery rib , peeled and diced 8 ounces okra 1 smoked sausage , diced 1 rotisserie-cooked chicken,[...]