Complex sentence: Now it is divided into the Italian Riviera and the French Riviera, although the French use the term "Riviera" to refer to the Italian Riviera and call the French portion the "Côte d'Azur".
Split into simpler sentences: Now it is divided into the Italian Riviera and the French Riviera. Although the French use the term "Riviera" to refer to the Italian Riviera, and call the French portion the "Côte d'Azur".