Complex sentence: He assumed the title upon his father's death in June 8,2000 and proclaimed by the Royal Succession Council (Pat a pulaus) on May 5,2005 and formally enthroned on December 12,2005.
Split into simpler sentences: He assumed the title upon his father's death in June 8,2000. He was proclaimed by the Royal Succession Council (Pat a pulaus) on May 5,2005 and formally enthroned on December 12,2005.