Original sentence: Alexander Joseph of Battenberg (April 5, 1857 - October 23, 1893), the first prince (knyaz) of modern Bulgaria, reigning from April 29, 1879 to September 7, 1886
Edited sentence: Alexander Joseph of Battenberg (April 5, 1857 – October 23, 1893) was the first prince (knyaz) of modern Bulgaria, reigning from April 29, 1879 to September 7, 1886