Complex sentence: Nri and Aguleri, where the Igbo creation myth originates, are in the territory of the Umeuri clan; they trace their lineages back to the patriarchal king-figure Eri.
Split into simpler sentences: Nri and Aguleri, where the Igbo creation myth originates, are in the territory of the Umeuri clan. They trace their lineages back to the patriarchal king-figure Eri.