Complex sentence: He enrolled in the University of California Los Angeles in 1925, but after a year he went to study at L'École des Sciences Politiques in Paris, France, from which he graduated in 1930.
Split into simpler sentences: He enrolled in the University of California Los Angeles in 1925, remaining there for one year. Barnes then went to study abroad in France at L'École des Sciences Politiques where he graduated in 1930.