Complex sentence: The extent of Hongi Hika's plans and ambitions are unkown-although he said, during his visit to England "There is only one king in England, there shall be only one King in New Zealand", this as likely bravado.
Split into simpler sentences: The extent of Hongi Hika's plans and ambitions are unkown. Although he said, during his visit to England "There is only one king in England, there shall be only one King in New Zealand", this as likely bravado.