Complex sentence: The buildings of the school are largely the creation of French architect Felix Duban, who undertook the main building in 1830, realigning the campus, and through 1861 completing an architectural program out towards the Quai Malaquias.
Split into simpler sentences: The buildings of the school are largely the creation of French architect Felix Duban, who was commissioned for the main building in 1830. His work realigned the campus, and continued through 1861, completing an architectural program out towards the Quai Malaquias.