Complex sentence: He competed in the July 1985 Interzonal, scoring 7/18; the 1990 Interzonal, scoring 6/13; and participated in the FIDE World Chess Championship 1998, where he was eliminated in the first round by Lembit Oll.
Split into simpler sentences: He competed in the July 1985 Interzonal, scoring 7/18, and the 1990 Interzonal, scoring 6/13. He also participated in the FIDE World Chess Championship 1998, where he was eliminated in the first round by Lembit Oll.