Complex sentence: On 30 July 1900, he died in his sleep at Schloss Rosenau in Coburg, making Maria Dowager Duchess of Saxe-Coburg and Gotha, the ducal throne went to Alfred's sixteen year old nephew, Charles Edward.
Split into simpler sentences: On 30 July 1900, he died in his sleep at Schloss Rosenau in Coburg. Maria became Dowager Duchess of Saxe-Coburg and Gotha, the ducal throne went to Alfred's sixteen year old nephew, Charles Edward.