Quick Chicken Gumbo

Name: Quick Chicken Gumbo
Ingredients: 1/3 cup long-grain white or brown rice; 2 teaspoons olive oil; 1 small onion, chopped; 1 small green bell pepper, chopped; 2 ribs celery, chopped; 2 cloves garlic, chopped; 1 tablespoon gumbo file powder (optional); 1 teaspoon paprika; 1 teaspoon dried thyme; 1/4 teaspoon salt; 2 cans (14 1/2 ounces each) fat-free reduced-sodium chicken broth; 2 cups (1/2 pound) shredded cooked boneless, skinless chicken breasts; 1 can (8 ounces) tomato sauce