Complex sentence: He is reportedly residing in Saudi Arabia, and runs his own firm, called Fame Advertising, in Jeddah; he is closely watched by the Saudi government, which has restricted his travel from the kingdom since 1996; reportedly, he has never disowned his father.
Split into simpler sentences: He is reportedly residing in Saudi Arabia, and is watched over closely by the Saudi government since 1996. Abdallah runs his own firm, called Fame Advertising, in Jeddah; he is closely watched by the Saudi government, which has restricted his travel from the kingdom since 1996; reportedly, he has never disowned his father.