Complex sentence: Daheshism (in Arabic الداهشية) is a religion established by Dr. Dahesh (real name Salim Moussa Achi) in 1942, who claimed it was a new religion based upon the Unity of Religions.
Split into simpler sentences: Daheshism (in Arabic الداهشية) is a religion established by Dr. Dahesh (real name Salim Moussa Achi) in 1942. Daheshism was established by Dr. Dahesh who claimed it was a new religion based upon the Unity of Religions.