Complex sentence: Don Devoto died in 1916 before the work on the mansion was complete and since he did not leave any descendants, and no one could be found to buy the eccentric house, so in 1938 it was divided into building lots on which houses were later constructed.
Split into simpler sentences: Don Devoto died in 1916 before the work on the mansion was complete. He did not leave any descendants, and no one could be found to buy the eccentric house; in 1938 it was divided into building lots on which houses were later constructed.