Simplify the following text for a Grade 16 native English-speaking person.
Original: One important step towards protecting albatrosses and other seabirds is the 2001 treaty the Agreement on the Conservation of Albatrosses and Petrels , which came into force in 2004 and has been ratified by thirteen countries , Australia , Argentina , Brazil and Chile Ecuador , New Zealand , Spain , South Africa , France , Peru , Uruguay and the United Kingdom .
Simplified: One important step towards protecting albatrosses and other seabirds is the 2001 treaty by the Agreement on the Conservation of Albatrosses and Petrels , which eight countries , Australia , Ecuador , New Zealand , Spain , South Africa , France , Peru and the United Kingdom , agreed with .