Complex sentence: Thoroughly disliking Prussia, he was in hearty accord with George in resisting her aggressive policy; and after the annexation of Hanover in 1866 he accompanied the exiled king to Hietzing.
Split into simpler sentences: Thoroughly disliking Prussia, he was in hearty accord with George in resisting the empire's aggressive policy. After the annexation of Hanover in 1866 he accompanied the exiled king to Hietzing.