Complex sentence: At the end of the monarchy, it was in the waters of Estoril that many sought refuge and escape; aristocrats, nobles and other exiles escaped through the ports along the Estoril coast to escape the Republican forces.
Split into simpler sentences: At the end of the monarchy, it was in the waters of Estoril that many sought refuge and escape. Aristocrats, nobles and others escaped through the ports along the Estoril coast to flee from the Republican forces.