Saute onions, garlic and carrots in olive oil till softened. Add broth, lentils and herbs and bring to a boil. Simmer, covered, 15 min. Add tomatoes, cover and cook 15-20 min. till lentils are tender. Stir in spinach and cook 5 min. Season with salt and pepper.
Cook pasta, toss with sauce, sprinkle with Parmesan.