Complex sentence: Harun al-Rashid becomes the Abbasid Caliph in Baghdad upon the death of his brother al-Hadi, and appoints Salim Yunisi as the Abbasid governor of Sindh and the Indus Valley.
Split into simpler sentences: Harun al-Rashid becomes the Abbasid caliph in Baghdad upon the death of his brother Al-Hadi. He appoints Salim Yunisi as governor of Sindh and the Indus Valley.