Complex sentence: In 1987, he became co-chairman of the Italian-Korean Meetings on Relativistic Astrophysics; in the years 1989-93, he was President of the Scientific Committee of the Italian Space Agency.
Split into simpler sentences: In 1987, he became co-chairman of the Italian-Korean Meetings on Relativistic Astrophysics. In the years 1989-93, he was President of the Scientific Committee of the Italian Space Agency.