Complex sentence: The permanent seat of the Eugenio Maria de Hostos School of law is the building that was once the Luis Muñoz Rivera elementary public school, which was built in 1924, being the Mayor of the city of Mayagüez, the Hon. Juan Rullan Rivera.
Split into simpler sentences: The permanent seat of the Eugenio Maria de Hostos School of Law is at the building that once was the Luis Muñoz Rivera elementary public school. The building was built in 1924, being the Mayor of the city of Mayagüez, the Honorable Juan Rullan Rivera.