Complex sentence: He was appointed envoy in Bucharest, Athens and Belgrade (accredited from Bucharest) on 26 September 1921, staying in this position until the 5 November 1924 when he took a leave of absence.
Split into simpler sentences: He was appointed envoy in Bucharest, Athens and Belgrade (accredited from Bucharest) on 26 September 1921. He stayed in this position until the 5 November 1924 when he took a leave of absence.