Complex sentence: A Minister Plenipotentiary in 1901, he represented France in Bulgaria (1907--1912) and Imperial Russia (1914--1917), and moved on to become General Secretary of the Foreign Ministry in the Alexandre Millerand cabinet.
Split into simpler sentences: A Minister Plenipotentiary in 1901, he represented France in Bulgaria (1907--1912) and Imperial Russia (1914--1917). He become General Secretary of the Foreign Ministry in the Alexandre Millerand cabinet.