Complex sentence: In the subsequent books written by his son, Brian Herbert, and Kevin J. Anderson, Arafel is synonymous to Kralizec, Armageddon and Ragnarok, all of which refer to the oncoming final battle of humanity with the thinking machines.
Split into simpler sentences: In the subsequent books written by his son, Brian Herbert, and Kevin J. Anderson, Arafel is synonymous to Kralizec, Armageddon and Ragnarok. They all refer to the oncoming final battle of humanity with the thinking machines.