Complex sentence: He has given master classes and recitals at Dartington International Summer School for many years, and was the third husband of Martha Argerich, they have a daughter together Stéphanie Argerich, who is a professional photographer.
Split into simpler sentences: He has given master classes and recitals at Dartington International Summer School for many years. He was the third husband of Martha Argerich; they have a daughter together, Stéphanie Argerich, who is a professional photographer.