Complex sentence: At the instigation of Bishop Tepano Jaussen of Tahiti, Atamu was appointed by Father Hippolyte Roussel as King to represent their interest alongside two to "opae" (councillors) and two judges.
Split into simpler sentences: At the instigation of Bishop Tepano Jaussen of Tahiti, Atamu was appointed by Father Hippolyte Roussel as King to represent their interest. He ruled alongside two to "opae" (councillors) and two judges.