Heat oven to 450° F. In a medium saucepan, over medium heat, combine the tomatoes and their juices, the oregano, and ¼ teaspoon salt. Bring to a boil.
Reduce heat and simmer, crushing the tomatoes with a wooden spoon, until the sauce thickens, 10 to 15 minutes.
Shape the dough into one 12- to 14-inch round and place on a baking sheet. Cover with the sauce and top with the mozzarella.
Bake the pizza until the crust is golden brown and crisp, about 20 minutes. Transfer to a cutting board.
Sprinkle with the basil, slice into wedges, and divide among plates.
In a large bowl, toss the lettuce and dressing. Top the pizza slices with the salad and sprinkle with the Parmesan.