Complex sentence: The House of the Post Office was built by French Architect Maquet between 1766 and 1768, and the thing was the building of the Ministry of Interior and State Security during the Francisco Franco dictatorship and it is currently the seat of the Presidency of the Madrid Community.
Split into simpler sentences: The House of the Post Office was built by French Architect Maquet between 1766 and 1768. It is currently the seat of the Presidency of the Madrid Community.