Complex sentence: Al-Janaby took over the city of Hajr, Bahrain's capital at that time, in addition to al-Hasa, which he made the capital of his republic and once in control of the state he sought to create a utopian society.
Split into simpler sentences: Al-Janaby took over the city of Hajr, Bahrain's capital at that time, and al-Hasa, which he made the capital of his republic. Once in control of the state he sought to create a utopian society.