Simplify the following text for a Grade 9 native English-speaking person.
Original: Canadian Navy ships that were carrying supplies to help people in the aftermath of Hurricane Katrina were slowed down because of Nate .
Simplified: Canadian Navy ships en route to the U.S. Gulf Coast , carrying relief supplies to assist in the aftermath of Hurricane Katrina , were slowed while trying to avoid Hurricanes Nate and Ophelia .