Kale with Red Bell Pepper

Name: Kale with Red Bell Pepper
Ingredients: 1 large bunch kale; 1 small red pepper cut in strips; 1 small onion slice; 2 small cloves garlic, chopped; 1 tablespoon brown sugar; 1 teaspoon salt or to taste; 2 tablespoons plus ½ teaspoon olive oil; 1 teaspoon red pepper flakes or to taste; 1 can of low sodium chicken broth; 2 to 3 tablespoons apple cider vinegar