Complex sentence: Ngāi Tahu, or Kāi Tahu, is the principal Māori iwi (tribe) of the southern region of New Zealand, with the tribal authority, Te Rūnanga o Ngāi Tahu, being based in Christchurch.
Split into simpler sentences: Ngāi Tahu, or Kāi Tahu, is the principal Māori iwi (tribe) of the southern region of New Zealand. The tribal authority, Te Rūnanga o Ngāi Tahu, is based in Christchurch.