def split_sites(structure, voronoi_point):
    """
    Split sites in a structure into sites that are Voronoi points and sites containing real species

    Args:
    :param structure: (Structure) target structure
    :return: (List of Sites, List of Sites) list of sites with Voronoi points, list of sites with real species
    """
    all_voronois = []
    other_sites = []
    for site in structure.sites:
        if site.species_string == voronoi_point:
            all_voronois.append(site)
        else:
            other_sites.append(site)
    return all_voronois, other_sites