Complex sentence: While this species is native to Australia, the species was accidentally introduced to New Zealand in the 1880s and has established a stable population in that country, largely confined to the North Island north of Tauranga and west of Te Kuiti.
Split into simpler sentences: While this species is native to Australia, the species was accidentally spread to New Zealand in the 1880s and has an established a stable population on the island. In New Zealand, the species is largely confined to the area north of Tauranga and west of Te Kuiti.