Complex sentence: Ike's eye began to clear out again and the system became better organized and based on an Air Force Reconnaissance Aircraft measurement, Ike had intensified into a Category Four six hours after being downgraded to a Category Two.
Split into simpler sentences: Ike's eye began to clear out again and the system became better organized. Based on an Air Force Reconnaissance Aircraft measurement, Ike had intensified into a Category Four six hours after being downgraded to a Category Two.