Complex sentence: Scilingo confessed to particpating in two such flights, with 13 and 17 people respectively, and says that the Argentine Navy is "still hiding what happened during the dirty war".
Split into simpler sentences: Scilingo confessed to particpating in two such flights, with 13 and 17 people respectively. Scilingo says that the Argentine Navy is "still hiding what happened during the dirty war".