Complex sentence: The Vusaratu clan is regarded as the highest chiefly clan, with regards to the people of Bau until the rise of the Tui Kaba clan leader, who exiled all vusaratu members.
Split into simpler sentences: The Vusaratu clan is regarded as the highest chiefly clan with regards to the people of Bau. This was until the rise of the Tui Kaba clan leader, who exiled all vusaratu members.