Complex sentence: On 22 February 1972, Shaikh Khalifa Bin Hamad Bin Abdullah Al-Thani took over from his father to become the Emir of Qatar and started the reorganisation of the government.
Split into simpler sentences: On 22 February 1972, Shaikh Khalifa Bin Hamad Bin Abdullah Al-Thani became the Emir of Qatar. When he became Emir of Qatar, Shaikh Khalifa started the reorganisation of the government.