Complex sentence: In 1805, after numerous work stoppages, the building was to assume its function that it had been built for, which was being a hospital, although only one-third of the proposed project by Sabatini was completed.
Split into simpler sentences: In 1805, after numerous work stoppages, the building was to assume its function that it had been built for, which was being a hospital. Although only one-third of the proposed project by Sabatini was completed.