So a girlfriend of mine and I were talking just the other day about how to make tomato sauce. My recommendation to her was to make raw tomato sauce because you'll keep those nutrients in tact. Also as long as you use it while it's room temperature, and you pour it on something that is warm/hot like noodles, veggies, quinoa, potatoes or anything else your heart desires you really don't need to heat the sauce too. The other food should provide plenty of heat.
So here is what I put in mine, and what I do:
Any tomatoes will do really, we'll say 6-8 romas (preferably local and organic)
Slice open, remove the seeds, cut into quarters
5-6 fresh basil leaves
1-2 tsp maple syrup
1/2 cup diced red onion
3 garlic cloves
2-3 sundried tomatoes that have been soaked
As much salt and pepper as you like
Place it all in the food processor or high speed blender. Taste it and make it your own. Pour it on whatever you like. If you want it thicker or must heat it, go ahead, but as you can see, sauce is not complicated.