1Heat oven to 400°F. Unroll dough onto ungreased large dark or nonstick cookie sheet. Starting at center, press out dough into 14x10-inch rectangle; cut into 4 (7x5-inch) rectangles.
2Spread 1 tablespoon of the pizza sauce on half of each rectangle to within 1/2 inch of edges. Top each with sausage, bell pepper, onion and mozzarella cheese. Fold dough in half over filling; press edges firmly with fork to seal. Prick tops with fork to vent. Sprinkle tops with Parmesan cheese.
3Bake 8 to 10 minutes or until golden brown. Serve calzones with remaining 1/2 cup pizza sauce for dipping.