Simplify the following text for a Grade 10 native English-speaking person.
Original: The Federal Emergency Management Agency ( FEMA ) is an agency of the United States Department of Homeland Security , initially created by Presidential Order on 1 April 1979 .
Simplified: The Federal Emergency Management Agency , or FEMA , is an agency of the United States Department of Homeland Security . The purpose of FEMA ( begun by Presidential Order on March 30 , 1979 )