Original:  In the end, it was Pasutan who became the fourth ruler of Deli, while his younger brother Umar got a separate territory and became the first ruler of the Serdang Sultanate.
Revised:  It was Pasutan who became the fourth ruler of Deli, while his younger brother Umar got a separate territory and became the first ruler of the Serdang Sultanate.
Edit intent: clarity