Complex sentence: As of March 2007, the center had no retention schedule approved by the National Archives and Records Administration and until it does, has no "disposition schedule"--its "records must be considered permanent and nothing may be deleted".
Split into simpler sentences: As of March 2007, the center had no retention schedule approved by the National Archives and Records Administration and until it does, has no "disposition schedule". Its "records must be considered permanent and nothing may be deleted".