Complex sentence: This enabled him to spend time in Rome and he in fact completed his education at the Académie de France in Rome, remaining there until 1861, his attendance at this school allowing him to work in the Villa Médicis.
Split into simpler sentences: This enabled him to spend time in Rome, and in fact he completed his education at the Académie de France in Rome, remaining there until 1861. His attendance at this school allowing him to work in the Villa Médicis.