Complex sentence: The former world record in the Clean and Jerk was in 1988 by Leonid Taranenko of the Soviet Union, but this is no longer considered a world record by the International Weightlifting Federation, since all the old records were annulled after a restructuring of weight classes.
Split into simpler sentences: The former world record in the Clean and Jerk was in 1988 by Leonid Taranenko of the Soviet Union. However this weight is not considered a world record by the International Weightlifting Federation, since all the old records were annulled after a restructuring of weight classes.