Del Monte Pasta sauce makes a fantastic base for semi-homemade sauce. We like to doctor them up with pantry pizzazz like chili paste, minced garlic, oregano, fresh basil, capers, and black olives. You don't need all of these, but at least one or two makes the sauce a lot better, and fit for company.
It has a little sugar in it, which cuts the acid nicely, and makes a smoother product that children really like. If you do get the meat flavored variety, you can satisfy a hearty appetite without adding meat and it's mostly vegetable protein, so it has health benefits.