Complex sentence: Enthoven was married to Justine Lévy from 1995 until they separated in 2004 because he left her for Carla Bruni with whom he had an affair and who is now married to former French president Nicolas Sarkozy.
Split into simpler sentences: Enthoven was married to Justine Lévy from 1995 until they separated in 2004. He left her for Carla Bruni with whom he had an affair and who is now married to former French president Nicolas Sarkozy.