Complex sentence: He was best known for his 1970-73 Bonanza role, where he played the teen orphan Jamie Hunter Cartwright, who was taken-in by the Cartwrights, and eventually became patriarch Ben's fourth son.
Split into simpler sentences: He was best known for his 1970-73 Bonanza role, where he played the teen orphan Jamie Hunter Cartwright. The character was taken-in by the Cartwrights, and eventually became patriarch Ben's fourth son.