Complex sentence: Thornton was a member of the Opals roster for several years, from 1989 to 1995 competing at two World Championships; 1990 held in Malaysia and 1994 held in Germany.
Split into simpler sentences: Thornton was a member of the Opals roster for several years, from 1989 to 1995. She competed at two World Championships, 1990 held in Malaysia and 1994 held in Germany.