Add an additional 2 Tbsp. oil to the skillet. Add onions and saute for another 5 minutes, or until translucent. Add garlic and saute for one minute. Add wine, and deglaze pan for one minute. Then add tomatoes, crushed red pepper, and oregano. Reduce heat to medium-low, and let simmer and reduce for 10-15 minutes, stirring occasionally. Remove from heat and set aside.