Complex sentence: Despite their increasingly differing political views and opinions however, Ernest accepted his second eldest nephew Prince Alfred, Duke of Edinburgh as his heir-presumptive, who upon Ernest's death on 22 August 1893 at Reinhardsbrunn, succeeded to the ducal throne.
Split into simpler sentences: Despite their increasingly differing political views and opinions however, Ernest accepted his second eldest nephew Prince Alfred, Duke of Edinburgh, as his heir-presumptive. Upon Ernest's death on 22 August 1893 at Reinhardsbrunn, Alfred succeeded to the ducal throne.