Complex sentence: In 1852, he imagined a Neo-Gothic decoration for the crypts of Basilica of Saint-Sernin, that were destroyed during the resumption of restoration work in the 1960s.
Split into simpler sentences: In 1852, he imagined a Neo-Gothic decoration for the crypts of Basilica of Saint-Sernin. It was destroyed during the resumption of restoration work in the 1960s.