Complex sentence: He was deputy only to Hamza in the formation of the Druze movement and became known as the "left wing" to Hamza's "right wing" and became a prominent leader after the disappearance of Al-Hakim, who was termed the Chief Chancellor.
Split into simpler sentences: He was deputy only to Hamza in the formation of the Druze movement and became known as the "left wing" to Hamza's "right wing". He became a prominent leader after the disappearance of Al-Hakim, who was termed the Chief Chancellor.