In a large bowl, combine all the ingredients and mix well. Turn them out into a greased 9- by 11- inch casserole dish or baking pan. Cover the dish tightly with aluminum foil and bake the Tzimmes in a preheated 375- degree oven for about 1 hour , or until the sweet potatoes and squash are tender. Stir the Tzimmes before serving to evenly distribute the sauce and slightly mash the apples.