Complex sentence: Rabbi Yisrael Ariel was the chief rabbi of the evacuated Israeli settlement of Yamit in the Sinai desert during the years when the Sinai was controlled by Israel, and the founder of the Temple Institute ("Machon HaMikdash").
Split into simpler sentences: Rabbi Yisrael Ariel was the chief rabbi of the evacuated Israeli settlement of Yamit in the Sinai desert during the years when the Sinai was controlled by Israel. Rabbi Ariel is the founder of the Temple Institute ("Machon HaMikdash").