Complex sentence: A priest informs the king that the Nile flooding was controlled by Khnum in the island of Elefantine, in the south of the valley: the god Khnum is angry, and for this reason, he does not allow the waters of the Nile to flow properly.
Split into simpler sentences: A priest informs the king who the Nile was controlled by Khnum in the island of Elefantine, in the south of the valley. The god is angry and for this reason he does not allow that the waters of the Nile flow properly.