In a large pot, brown the sausage over medium heat, breaking it into smaller chunks as it cooks.
Add the onion and garlic, and cook until softened and fragrant. Stir in the tomato paste and cook 2-3 minutes.
Add the diced tomatoes, oregano, salt, pepper, sugar, and chicken broth. Bring the mixture to a simmer, then stir in the lasagna noodles. Cook 15-20 minutes, or until the noodles are tender.
Serve hot topped with a dollop of ricotta cheese and a sprinkle of mozzarella.