Complex sentence: Suppiluliumas reacted with rage at the news of his son's death and accusing the Egyptians he retaliated by going to war against Egypt's vassal states in Syria and Northern Canaan and captured the city of Amki.
Split into simpler sentences: Suppiluliumas reacted with rage at the news of his son's death and accused the Egyptians. Then, he retaliated by going to war against Egypt's vassal states in Syria and Northern Canaan and captured the city of Amki.