Complex sentence: The Bazin people were under the protection of the Abyssinian Empire, which was made clear in the so-called "Ezana Stone" where an unnamed Aksumite Emperor defended the Bazin from invading Noba.
Split into simpler sentences: The Bazin people were under the protection of the Abyssinian Empire. This was made clear in the so-called "Ezana Stone", wherein an unnamed Aksumite Emperor is said to have defended the Bazin from invading Noba.