Heat 1 tablespoon olive oil in a large skillet over medium heat. Add sausages, and brown evenly, about 6 to 7 minutes. Add remaining 2 tablespoons olive oil, onion and carrots. Saute for 4 to 5 minutes. Add garlic, and saute 2 minutes more. Add tomatoes, vinegar, sugar, pepper flakes, olives, basil and oregano, and cook for 3 minutes. Season to taste with salt and pepper.