Complex sentence: Here Lord Ellenborough's policy led Napier to Sindh Province (Scinde), for the purpose of quelling the insurrection of the Muslim rulers who had remained hostile to the British Empire following the First Anglo-Afghan War.
Split into simpler sentences: Here Lord Ellenborough's policy led Napier to Sindh Province (Scinde), for the purpose of quelling the insurrection of the Muslim rulers of this region. They had remained hostile to the British Empire even after the end of the First Anglo-Afghan War.