Complex sentence: Pia was greatly affected by the scandal between her mother and the Italian director Roberto Rossellini because her mother's out-of-wedlock pregnancy caused Pia to be without her mother until 1957 as Ingrid fled to Italy.
Split into simpler sentences: Pia was greatly affected by the scandal between her mother and the Italian director Roberto Rossellini. Her mother's out-of-wedlock pregnancy caused Pia to be without her mother until 1957 as Ingrid fled to Italy.