def build_simple_seq_string(concatamer):
    """

    Simple function to simplify concatamer sequence to string

    Parameters
    ----------
    concatamer_col : str
        Contacamer string, which is in the form [K].MWGRSTLLYSRX.[L]

    Returns
    -------
    seq : str
        Simplified sequence.

    """
    return concatamer.split('.')[1]
