Complex sentence: In the First Genoese-Savoyard War of 1625, Charles Emmanuel tried with the help of France to obtain access to the Mediterranean Sea at the expense of Genoa, but after Spanish intervention, the status-quo was restored in the Treaty of Monçon.
Split into simpler sentences: In the First Genoese-Savoyard War of 1625, Charles Emmanuel tried with the help of France to obtain access to the Mediterranean Sea at the expense of Genoa. After Spanish intervention, the status-quo was restored in the Treaty of Monçon.