In a large skillet over medium heat, heat oil. Add onions and season with salt and pepper. Sauté until beginning to soften, then stir in garlic and cook until fragrant, about 1 minute. Add tomatoes and stir to combine. Continue to cook over medium heat to let the tomatoes start to break down.
Cook the pasta as shown on the package. When the mixture reaches a simmer, reduce heat slightly and stir in butter. Season again with salt and pepper, add oregano, and let simmer about 15 minutes more to allow the flavors to develop. Place in a skillet with tomatoes and stir.
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