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Add olive oil to large skillet.
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Sautee onions and garlic, over medium heat, until onions are soft and translucent.
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Add sausage and cook, breaking up with wooden spoon while it browns.
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Once sausage is cooked through, add tomatoes, tomato sauce, chicken broth, and ravioli.
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If using whole peeled tomatoes, use kitchen shears to chop them up while still in the can before adding to skillet.
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Bring mixture to a boil, then reduce heat and simmer over medium heat.
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Simmer until ravioli are tender and sauce has reduced and thickened, 15-20 minutes
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Remove from heat and stir in mozzarella and parmesan.