In a large saucepan, sauté garlic, red bell pepper, onions, and sausage in olive oil. In a medium pot, add vegetable stock, sugar, salt and pepper and bring to a boil. Add greens and bring to a boil again. Lower heat to medium, cover pot and cook for 35 minutes. Add sautéed mixture and half-and-half. Stir and simmer 10 minutes.