Complex sentence: Umi was brought to court on an equal footing with his half brother Hakau, who was the son of Liloa with his first wife, Pinea from an ali'i family of equal rank to that of her husband.
Split into simpler sentences: Umi was brought to court on an equal footing with his half brother Hakau. His half brother Hakau was the son of Liloa with his first wife, Pinea from an ali'i family of equal rank to that of her husband.