Complex sentence: Under the guidance of Wayne Thorpe, he represented New Zealand at the 1982 Commonwealth Games in Brisbane; and the 1984 Summer Olympics in Los Angeles, when he came fifth in the 1 km time trial.
Split into simpler sentences: Under the guidance of Wayne Thorpe, he represented New Zealand at the 1982 Commonwealth Games in Brisbane. Adair then attended the 1984 Summer Olympics in Los Angeles, when he came fifth in the 1 km time trial.