Complex sentence: Mahmud al Hasan, the principal of the Deobandi school, left India to seek the help of Galib Pasha, the Turkish governor of Hijaz, while another Deoband leader, Maulana Ubaidullah Sindhi, travelled to Kabul to seek the support of the Emir of Afghanistan.
Split into simpler sentences: Mahmud al Hasan, the principal of the Deobandi school, left India to seek the help of Galib Pasha, the Turkish governor of Hijaz. Another Deoband leader, Maulana Ubaidullah Sindhi, travelled to Kabul to seek the support of the Emir of Afghanistan.