Sausage and Lentil Chowder

Name: Sausage and Lentil Chowder
Ingredients: * 1 pound french green lentil; * 1 pound italian sausage link, sliced; * 1/4 cup olive oil, divided; * 2 cup chopped yellow onion; * 2 leek, cleaned and white part chopped; * 1 tablespoon minced garlic; * 4 stalk celery, diced; * 4 carrot, peeled and diced; * 2 bell pepper, diced; * 2 14 1/2 ounce can stewed tomato; * 1 teaspoon kosher salt (may need to adjust depending on saltiness of; chicken broth); * 1 teaspoon freshly ground black pepper; * 1 tablespoon minced fresh thyme; * 1 teaspoon cumin; * 2 quart chicken broth; * piece of parmesan rind, optional