Shrimp and Sausage Gumbo

Name: Shrimp and Sausage Gumbo
Ingredients: 1 pound sliced andouille sausage or other smoked sausage; 2 to 3 teaspoons vegetable oil; 6 cups chicken broth; 2 (14.5 ounce) cans tomatoes, diced; 1/2 cup vegetable oil; 1/2 cup all-purpose flour; 1 large onion, chopped; 1 cup chopped celery; 1 red bell pepper, chopped; 1 yellow or green bell pepper, chopped; 2 teaspoons vegetable oil; 1 1/2 cups fresh or frozen thawed okra slices; 1 teaspoon Creole or Cajun seasoning; 1 bay leaf; 1 pound medium shrimp; salt and pepper, to taste; hot boiled rice; chopped fresh parsley or sliced green onions for garnish (optional)