Complex sentence: In an interview, she recalled that she forced herself to write a song per day to keep up with Berger, who commissioned her to write songs for Isabelle de Funès, niece of French actor, Louis de Funès.
Split into simpler sentences: In an interview, she recalled that she forced herself to write a song per day to keep up with Berger. She kept on working with Berger, who commissioned her to write songs for Isabelle de Funès, niece of French actor, Louis de Funès.