In a large stockpot or Dutch oven, saute the garlic and olive oil over medium heat, just until fragrant, about 1 minute.
Add remaining ingredients except for salt, pepper, and sugar. Bring marinara to a simmer over medium high heat. Reduce heat to medium low, cover the pan, and cook for 30-45 minutes.
Discard the basil leaves. Taste the sauce and add sugar, salt, and pepper to taste.
Notes
Store in a covered container in the refrigerator for 5-7 days, or freeze in an airtight container for up to 3 months. Feel free to add fresh herbs to the sauce, such as oregano, bay leaf, and thyme.The sugar takes some of the acidity out of the finished sauce. Stir it in at the end so that you can balance the flavors to your liking.