Shortcut Lasagna Made With Ravioli

Name: Shortcut Lasagna Made With Ravioli
Cuisine: Italian
Ingredients: One 20-ounce package refrigerated ravioli of any type; 1 pound sweet or spicy Italian sausage; casings removed; 1 tablespoon minced garlic; One 28-ounce can crushed tomatoes; One 15-ounce can tomato sauce; 2 tablespoons minced fresh oregano; 1 tablespoon sugar; ½ teaspoon kosher salt; plus more for seasoning; ¼ teaspoon black pepper; 8 ounces shredded mozzarella cheese; divided