Complex sentence: In 1830, the nuns of the Teaching of the Indies used the building to found their school, and occupied it until 1834, after which the Sisters of Charity occupied the building in March 1845 and managed it until 1873.
Split into simpler sentences: In 1830, the nuns of the Teaching of the Indies used the building to found their school, and occupied it until 1834. The Sisters of Charity occupied the building in March 1845 and managed it until 1873.