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3. Spice It Up
A few herbs and spices add a lot of flavor to pre-made sauce. Add a teaspoon or two of thyme, oregano, basil, or even a small pinch of red pepper flakes if you like a little heat. Just remember that your sauce might already have some of these as ingredients, so don't go overboard on them.
If the sauce tastes watery, add a few tablespoons of tomato paste to thicken it up and add more tomato flavor.

4. Deglaze Your Pan
If you add sautéed vegetables or meat, stir in a little stock or wine before adding the sauce to release any bits stuck to the bottom of the pan. This is called deglazing, and it helps incorporate all the flavors into your sauce that would otherwise just be burnt onto the cooking surface.

5. Let It Simmer
If you have any time at all, let your sauce simmer for a while. Even if it's just 20 minutes, it helps concentrate the flavors and thicken the sauce.

Article Source: Wonder How To