Complex sentence: In August 2010, Assange gave "Guardian" journalist David Leigh the file's encryption passphrase to allow him to access it, telling him that it was a temporary password for a file that would soon be deleted.
Split into simpler sentences: In August 2010, Assange gave "Guardian" journalist David Leigh the file's encryption passphrase to allow him to access it. Leigh's understanding was that it was a temporary password for a file that would soon be deleted.