Complex sentence: Maurice Ronet was born Maurice Julien Marie Robinet in Nice, Alpes Maritimes, the only child of professional stage actors Émile Robinet and Gilberte Dubreuil.
Split into simpler sentences: Maurice Ronet was born Maurice Julien Marie Robinet in Nice, Alpes Maritimes. He was the only child of professional stage actors Émile Robinet and Gilberte Dubreuil.