Complex sentence: Kasai has competed in seven Olympics during his career--a record for a ski jumper--and earned his best individual finish of 5th in the individual large hill at the 1994 Winter Olympics in Lillehammer.
Split into simpler sentences: Kasai has competed in seven Olympics during his career--a record for a ski jumper. He finished 5th in the individual large hill at the 1994 Winter Olympics in Lillehammer.