Place a gallon size heavy-duty zip-top bag into a large bowl. Place the onion and next 9 ingredients into the zip-top bag, combining well. Add the chicken and chicken-apple sausage to the marinade. Close the bag and place in the refrigerator to marinate for at least 4 hours or up to 24 hours. Preheat oven to 450 degrees. Arrange the chicken pieces in a large roasting pan, skin-side up. Pour all of the marinade, including onions and lemons over and around the pieces. Tuck the sausages, apples, and potatoes around the chicken. Cook for 1 hour and 15 minutes, turning sausages about halfway through to cook evenly. Arrange chicken, sausages, and potatoes on a platter and sprinkle with chopped fresh sage.