Complex sentence: Joseph Gregorio II (c.1847--21 November 1868) was the 36th King or ʻAkariki (paramount chief), as well as the last king of the island of Mangareva, and other Gambier Islands including Akamaru, Aukena, Taravai and Temoe.
Split into simpler sentences: Joseph Gregorio II (c.1847--21 November 1868) was a monarch of Mangareva and the other Gambier Islands. He was the 36th King or ʻAkariki (paramount chief), as well as the last king of the island of Mangareva, and other Gambier Islands including Akamaru, Aukena, Taravai and Temoe.