Place a large Dutch oven on the stovetop over medium heat. Pour in the 2 cups low-sodium chicken broth and both (8-oz) cans tomato sauce; stir to combine.
Add the shredded rotisserie chicken, 1-1/2 cups peeled, chopped red potatoes, 1-3/4 cups frozen lima beans, and 1-3/4 cups frozen whole kernel corn to the pot.
Add 1 tsp sugar, 1/4 tsp salt, 1/2 tsp pepper, 1/4 tsp ground red pepper, 1/4 tsp oregano, 1/4 tsp poultry seasoning, and 2 Tbsp dried minced onion flakes; stir everything together.
Increase heat and bring the mixture to a boil, stirring as needed to prevent sticking.
Once boiling, reduce the heat to low (maintain a gentle simmer), cover, and simmer for 30 to 45 minutes, stirring occasionally, until the potatoes and other vegetables are tender and the stew is heated through.
Remove from heat and serve hot.