def flatten_lists_one_level(potential_list_of_lists):
    """
    Wrapper to unravel or flatten list of lists only 1 level
    :param potential_list_of_lists: list containing lists
    :return: flattened list
    """
    flat_list = []
    for potential_list in potential_list_of_lists:
        if isinstance(potential_list, list):
            flat_list.extend(potential_list)
        else:
            flat_list.append(potential_list)
    return flat_list