Place the squash on a baking sheet and roast until tender, about 25 minutes.
Meanwhile, bring a large ovenproof pot of lightly salted water to the boil.
Add the pasta and cook until al dente, about 11 minutes.
Drain, rinse and drain again.
Lower the oven to 350 degrees.
Place the pasta back in the pot and add the squash, butter, chicken broth, 2 tablespoons of the sage, 2 teaspoons of the salt, 1/2 teaspoon pepper and 2 tablespoons Parmesan.
Toss to mix well.
In a small bowl, combine the bread crumbs, remaining 2 teaspoons sage, 1/2 teaspoon salt, 1 tablespoon Parmesan and pepper to taste.