A lot of commercially produced sauce have a high amount of either salt or sugar, or both. Stay away from those.
Ragu Pizza sauce is fairly low-key in all of the departments, it might be a good base for a pizza sauce with a commercial touch to it.
Good for when you want to emulate NYC style pizzas.
To thin it down, but maintaining the flavor, I'd say first taste then read the label and then increase all the ingredients' amounts by starting with a pinch until you have the balance you're looking for.
Ingredients:TOMATO PUREE (WATER, TOMATO PASTE), SOYBEAN OIL, SALT, SPICES, NATURAL FLAVOR.
Now what the spices are I don't know. My guess is Oregano, Basil, perhaps Sage, Sugar and Garlic. Maybe a touch of Fennel...
Don't cook the sauce afterwards because Ragu is already cooked.
Ragu's Nutrtional Info: