Complex sentence: In 1968, upon being awarded the Chaloner Prize through the Rome Prize competition, he began what would be an almost three year sojourn in France; first living in Vincennes and later awarded a residency at le Cité Internationale des Arts.
Split into simpler sentences: In 1968, upon being awarded the Chaloner Prize through the Rome Prize competition, he began what would be an almost three year sojourn in France. There he was awarded a residency at le Cité Internationale des Arts.