Complex sentence: After his sporting career was also an actor in some films, he would appear opposite Maria Callas in the film version of "Medea" by Pier Paolo Pasolini, in the role of Jason.
Split into simpler sentences: After his sporting career, he was also an actor in some films. He appeared opposite Maria Callas in the film version of "Medea" by Pier Paolo Pasolini, in the role of Jason.