Complex sentence: Between the 17th and 19th centuries, the area was an important meeting place: as the goal for the couriers coming from abroad and other parts of Spain to the Post Office, it was visited by those eager for the latest news.
Split into simpler sentences: Between the 17th and 19th centuries, the area was an important meeting place. As the goal for the couriers coming from abroad and other parts of Spain to the Post Office, it was visited by those eager for the latest news.