Complex sentence: The border thus divided the westside territory for Bola'ang and the eastside territory for Minahasan people, which made the kingdom of Bola'ang lose all of its territories and subjects on the east side of the borders.
Split into simpler sentences: The border thus divided the westside territory for Bola'ang and the eastside territory for Minahasan people. This made the kingdom of Bola'ang lost all of its territories and subjects on the eastside of the borders.