In a large skillet, saute onion in butter and oil until tender.Add garlic; cook 1 minute longer. Add wine. Bring to a boil; cook until liquid is reduced to 1/2 cup. Add the tomatoes, rosemary, sugar, oregano, salt and pepper. Bring to a boil over medium heat. Reduce heat; simmer, uncovered, for 15 minutes., Meanwhile, cook linguine according to package directions. Add scallops and shrimp to tomato mixture; cook until shrimp turn pink and scallops are firm and opaque, 4-5 minutes. Stir in parsley. , Drain linguine. Serve seafood mixture with linguine; if desired, sprinkle with cheese.