Complex sentence: He was elevated to princely rank by Emperor Franz Joseph I of Austria on July 19,1911 but, leaving no sons, he was succeeded in the princely title by his brother Jaroslav (1864-1929).
Split into simpler sentences: He was elevated to princely rank by Emperor Franz Joseph I of Austria on July 19,1911. Leaving no sons, he was succeeded in the princely title by his brother Jaroslav (1864-1929).