Complex sentence: In 1903, he wrote a "Breton Suite" in three parts and then Brocéliande "morning": these two works are extracted from a second opera, "Myrdhin" (1902-1909) which has never been performed.
Split into simpler sentences: In 1903, he wrote a "Breton Suite" in three movements and then the "Brocéliande de matin". These two works were extracts from his second opera, "Myrdhin" (1902-1909), which has never been performed.