Original: The depression quickly strengthened and reached hurricane strength the September 11, peaked as a Category 2 hurricane on September 12 as it made a half circle, weakened to a Category 1 on September 16 and bounced back the way it came.
Simplified: The depression quickly strengthened and reached hurricane strength on September 11; Earl reached its strongest point on September 12, as a Category 2 hurricane as it travelled in a half circle.