Paul's Sausage, Bell Peppers, and Onion Hero

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2 tablespoons extra-virgin olive oil

12 ounces mild Italian sausage, sliced 

7 ounces marinara sauce, plus more for topping 

2 bell peppers, thinly sliced 

1 large onion, thinly sliced 

1 teaspoon salt 

1 teaspoon pepper 

4 crusty, semolina seeded or plain 10-inch submarine sandwich rolls 

8 ounces whole-milk mozzarella cheese, shredded