Complex sentence: Signifying the determination of France on its intervention in Syria was the naming of General Henri Gouraud as high commissioner in Syria-Cilicia, and the occupation of his troops of the Syrian coastal region replacing British troops there.
Split into simpler sentences: Signifying the determination of France on its intervention in Syria was the naming of General Henri Gouraud as a high commissioner in Syria-Cilicia. The troops of General Gouraud occupied the Syrian coastal region replacing British troops there.