Complex sentence: On his way back north, he visited the Dowager Empress Marie Feodorovna in Kiev, who enlisted his help in order to persuade Nicholas II and his wife of the need for change and the damaging influence of Rasputin.
Split into simpler sentences: On his way back north, he visited the Dowager Empress Marie Feodorovna in Kiev. She enlisted his help in order to persuade Nicholas II and his wife of the need for change and to get rid of the damaging influence of Rasputin.