Complex sentence: He published "History of the Sikhs" in 1849, in which he criticised Sir Henry Hardinge's management of the Sikh War and which then brought about his dismissal from political service since the views expressed in this work were anything but pleasing to his superiors.
Split into simpler sentences: He published "History of the Sikhs" in 1849, which brought about his dismissal from political service. The views expressed in this work were anything but pleasing to his superiors.