Complex sentence: He made his film debut with a minor part in "Back to the Future Part II" (1989), then landed a succession of larger roles that made him a critically acclaimed child actor by age 9, being nominated for several Young Artist Awards.
Split into simpler sentences: He made his film debut with a minor part in "Back to the Future Part II" (1989). Landing a succession of larger roles, he was critically acclaimed as a child actor by age 9, being nominated for several Young Artist Awards.