def format_data(data):
    """
    Convert data into list of list of tokens.

    parameters
    -----------
    :param data: list of str
    :return: list of list of tokens
    """
    formated_data = []
    for i in data:
        temp = []
        for j in i.split():
            temp.append(j)
        formated_data.append(temp)
    return formated_data