Complex sentence: Many Breton families have also emigrated to the Americas, predominantly to Canada (mostly Québec and the Maritimes) the United States and the first French settlers of the French Antilles were from Brittany.
Split into simpler sentences: Many Breton families have also emigrated to the Americas, predominantly to Canada (mostly Québec and the Maritimes) and the United States. The first French settlers of the French Antilles were from Brittany.