Heat a large skillet over low heat. After cutting the chicken into 1-inch pieces, transfer to the skillet. Mix the pineapple juice, chicken broth, vinegar, brown sugar, soy sauce, and garlic in a medium bowl, and pour into the skillet. Cover the pan and simmer for 10 minutes or until the chicken is cooked through. Add the vegetables and pineapple to the skillet and continue to simmer for 5 minutes.