To cook lentils: Add chicken broth, water, oregano, thyme and rosemary. Bring to a boil. Add lentils. Bring back to a boil. Cover. Reduce heat to medium-low. Simmer for 20 minutes (or longer). Stir occasionally.
To cook pasta: Add crushed tomatoes and pasta. Bring to a boil. Cover. Reduce heat to medium-low. Simmer for 10 minutes. Stir occasionally to prevent lentils and pasta from sticking to bottom of pan. Add lemon juice, salt and pepper. Garnish each serving with parmesan cheese.