Translate the following English sentence to French:
"The most interesting parts of his work are surely those which refer to the subject of the report, that is to say 1998, and OLAF, the body which is presenting its first piece of work."
Les parties les plus intéressantes de son travail sont certainement celles qui font référence à l'objet du rapport, l'année 1998, ou à l'instrument, l'OLAF, qui nous remet son premier travail.