In large saucepan or Dutch oven, heat oil over medium heat. Add carrots, celery and onion. Cook 8 to 10 minutes or until softened, stirring occasionally. Stir in garlic, salt and brown sugar. Cook 30 seconds. Stir in tomatoes and 1 & 1/4 cups of the broth; bring to a boil. Reduce heat. Cover; simmer 15 minutes or until vegetables are tender.In small bowl, whisk remaining 1/4 cup broth and cornstarch. Stir into vegetables. Add beans and okra. Bring to a boil; reduce heat. Simmer 2 to 3 minutes or until okra is tender.