Greg,

I too love that sauce - as kooky as it sounds. In the summertime when we were off school, my sister and I used to make at least 3 of those mixes a week. I've changed what I eat now but when I do make homemade pizza and crave that, here's what I do which I find most similar:

1 can Hunt's tomato sauce (I do 8 oz at a time)
1/2 tsp. oregano
1/4 to 1/2 tsp. nature's seasons (seasoning mix found in the spice section of most any grocery store)

Vary the nature's seasons depending on your taste...start small and add as you see fit. I know it sounds too simple but I think it's close.