Complex sentence: At only 19, Decaris won the "Concours de Rome", the most prized award for young artists in France at the time, and was elected fellow of the French "Académie des Beaux Arts" in 1943.
Split into simpler sentences: At only 19, he won the "Concours de Rome", the most prized award for young artists in France at the time. He has been elected fellow of the French "Académie des Beaux Arts" in 1943.