Complex sentence: In 1914, Charles took up a post in the governor's cabinet, enlisting in 1916 in the Tirailleurs Sénégalais and fighting in World War I, earning a promotion to sergeant.
Split into simpler sentences: In 1914, Charles took up a post in the governor's cabinet. He enlisted in 1916 in the Tirailleurs Sénégalais and fought in World War I, earning a promotion to sergeant.