Make this Bahamian chowder at home

Name: Make this Bahamian chowder at home
Ingredients: 2 tablespoon olive oil; 2 tablespoon unsalted butter; 1 onion, diced; 1 carrot, diced; 2 cloves garlic, minced; 1 quart chicken broth; 3 medium white potatoes, diced; 2 stalks celery, diced; 1 green pepper, seeded and diced; 1 red pepper, seeded and diced; 1 jalapeno pepper, seeded and diced; 3 bay leaves; 2 sprigs thyme; 2 tablespoon chopped parsley; 1 pound frozen chopped conch, thawed; 2 (6-ounce) cans chopped clams with juice; 2 beefsteak tomatoes, chopped; 1 cup marinara sauce, homemade or jarred