Complex sentence: An army of the Otaibah tribe was then led by Sultan ibn Bjad Bin Humaid otherwise known as "Sultanaldeen", and Eqab bin Mohaya Alotaibi the head of the Talhah clan of Otaibah, that supported King Abdul-Aziz build the Kingdom of Saudi Arabia.
Split into simpler sentences: An army of the Otaibah tribe was then led by Sultan ibn Bjad Bin Humaid otherwise known as "Sultanaldeen", and Eqab bin Mohaya Alotaibi the head of the Talhah clan of Otaibah. This army supported King Abdul-Aziz build the Kingdom of Saudi Arabia.