Dice carrots and celery, bring broth to a boil in a large pot with the vegetables and lentils, then reduce heat and simmer for 15 minutes.
Stir in crushed tomatoes, Italian herbs, and salt and pepper to taste; simmer 5 more minutes while pasta cooks separately.
Cook pasta in salted boiling water until al dente, drain, and toss with the lentil sauce.
Serve in shallow bowls with a drizzle of olive oil and fresh basil if available.