Simplify the following text for a Grade 8 native English-speaking person.
Original: The agreement has been amended several times , most recently in 2003 , which was made in the name of the Co-operative Party rather than the Co-operative Union .
Simplified: The agreement has been changed several times , most recently in 2003 . The 2003 agreement was the first between the Labor Party and the Co-operative Party , instead of the Co-operative Societies .