Cook and drain pasta as directed on package.
Meanwhile, cut sausage crosswise into 1/4-inch slices. Spray 12-inch nonstick skillet with cooking spray; heat over medium-high heat. Add sausage; stir-fry 4 to 6 minutes or until brown. Stir in broth. Cover and cook over medium heat 5 minutes.
Stir in squash, tomatoes and 2 tablespoons of the basil. Heat to boiling; reduce heat. Cover and simmer 5 minutes, stirring occasionally. Stir in onions. Simmer uncovered 1 minute.
Toss pasta, oil and remaining 2 tablespoons basil. Divide pasta among bowls. Top with sausage mixture.