It's not as bad as it looks. Half those ingredients are sub-ingredients. It's like you making something like chili and using salsa. You'd then need to add all the ingredients of the salsa to your chili ingredients. With the sub-ingredients removed it comes down to this:

ENRICHED WHEAT FLOUR, WATER, LOW-MOISTURE PART-SKIM MOZZARELLA CHEESE, TOMATO PASTE, COOKED SEASONED PIZZA TOPPING (MADE WITH PORK AND CHICKEN, BHA, BHT AND CITRIC ACID ADDED TO HELP PROTECT FLAVOR), PEPPERONI MADE WITH PORK, CHICKEN AND BEEF, COOKED BEEF PIZZA TOPPING, SUGAR, WHEAT GLUTEN,

2% OR LESS OF VEGETABLE OIL, DEGERMINATED WHITE CORN MEAL, YEAST, SALT, DEGERMINATED YELLOW CORN MEAL, DATEM, BAKING SODA, SPICES, WHEAT FLOUR, ENZYMES, DRIED GARLIC, ASCORBIC ACID.