Complex sentence: As of, there are no verified living supercentenarians in Norway, but there is one reported supercentenarian whose lifespan is unverified, Helene Nilsen who, at age may currently be Norway's oldest person.
Split into simpler sentences: As of, there are no verified living supercentenarians in Norway, but there is one reported supercentenarian whose lifespan is unverified. She is Helene Nilsen who, at age, may currently be Norway's oldest person.