Complex sentence: Stanley was eventually found in 1959 and agreed to assist in the restoration project after much persuasion, and made three trips to Singapore between 1963 to 1988 to restore his former paintings.
Split into simpler sentences: Stanley was eventually found in 1959 and, after much persuasion, agreed to assist in the restoration project. He and made three trips to Singapore between 1963 to 1988 to restore his former paintings.