Complex sentence: Dasch entered a convent to study for the priesthood at the age of 13 and, in 1917, at the age of 14, he was kicked out and enlisted in the German Army, serving in Belgium for eleven months.
Split into simpler sentences: Dasch entered a convent to study for the priesthood at the age of 13. In 1917, at the age of 14, he was kicked out and enlisted in the German Army, serving in Belgium for eleven months.