Complex sentence: Harris made his debut as a leading man in the title role of Gianfranco Parolini's "Sansone"/ "Samson" in 1961 and had a long and continuing relationship in several films written and directed by Parolini.
Split into simpler sentences: Harris made his debut as a leading man in the title role of Gianfranco Parolini's "Sansone"/ "Samson" in 1961. Harris had a long and continuing relationship in several films written and directed by Parolini.