Complex sentence: The second entry is for the mother of the subject of the first article entry, who is notable in her own right but neither is notable for a reason having directly to do with their Slavic ancestry (or their residency in New Zealand).
Split into simpler sentences: The second entry is for the mother of the subject of the first article entry. Both are notable in her own right but neither is notable for a reason having directly to do with their Slavic ancestry (or their residency in New Zealand).