Complex sentence: These chieftains were men of great leadership and wisdom, each of whom commanded their own retinue of Maori Toa or "Toa" and were the holders of power specifically land and established strict boundaries between other "Rangatira".
Split into simpler sentences: These chieftains were men of great leadership and wisdom, each of whom commanded their own retinue of Maori Toa. They were the holders of power (land, that is) and established strict boundaries between their own and other "Rangatira".