Dust chicken with flour. Season with salt and pepper. In a large skillet, brown chicken on all sides in oil and butter over medium-high heat. Remove chicken to platter. , In the same skillet, cook and stir the onion, celery, pepper and mushrooms for 5 minutes. Stir in the tomatoes, tomato sauce, tomato paste, wine, herbs, garlic and sugar. Bring to a boil. Reduce heat; cover and simmer for 30 minutes., Return chicken to skillet. Cover and simmer for 45-60 minutes or until chicken is tender. Serve over pasta and sprinkle with Parmesan cheese. Freeze option: Cool chicken mixture. Freeze in freezer containers. To use, partially thaw in refrigerator overnight. Heat through slowly in a covered skillet until a thermometer inserted in chicken reads 165°, stirring occasionally.