def split_sample(labels):
    """
    Split the 'Sample' column of a DataFrame into a list.

    Parameters
    ----------
    labels: DataFrame
        The Dataframe should contain a 'Sample' column for splitting.

    Returns
    -------
    DataFrame
        Updated DataFrame has 'Sample' column with a list of strings.
    """
    sample_names = labels["Sample"].str.split(" ", n=1, expand=False)
    labels['Sample'] = sample_names
    return labels