Complex sentence: Yogyakarta and Pakualam were later united to form the Yogyakarta Special Region and the Sri sultan became Governor of Yogyakarta and the Prince of Pakualaman vice-governor; both were responsible to the President of Indonesia.
Split into simpler sentences: Yogyakarta and Pakualam were later united to form the Yogyakarta Special Region. The Sri sultan became Governor of Yogyakarta, and the Prince of Pakualaman became vice-governor; both were responsible to the President of Indonesia.