Complex sentence: This appears to be in error as, according to the Australian Dictionary of Biography Dimantina was borne on Zante, another of the Ionian Islands, a British protectorate at the time referred to collectively rather than individually.
Split into simpler sentences: This appears to be in error as, according to the Australian Dictionary of Biography Dimantina was borne on Zante, another of the Ionian Islands. The Ionian Islands, now part of Greece, was a British protectorate at the time and likely referred to collectively rather than individually.