Original sentence: Custodian of the Two Holy Mosques, a relatively new term, is the title given to the King of Saudi Arabia intended to give a sense of legitimacy to the King as a protector of the two holy cities of Mecca and Madinah, which had traditionally been the role of the Caliph
Edited sentence: Custodian of the Two Holy Mosques is a title given to the King of Saudi Arabia.It is a new term, and was not used in the past.Since the formation of Saudi Arabia occurred a few years after the abolition of the Islamic Caliphate, the title was created to give a sense of legitimacy to the King as a protector of the two holy cities of Mecca and Madinah, which had traditionally been the role of the Caliph