Complex sentence: Mahine Tamatoa became a king in 1810 after abdicated of Tenania Tamatoa his brother.in 1815 he abdicated for his niece Teri'itaria of Raiatea.
Split into simpler sentences: Mahine Tamatoa became a king in 1810 after the abdication of Tenania Tamatoa, his brother. In 1815 he abdicated for his niece Teri'itaria of Raiatea.