Simplify the following text for a Grade 12 native English-speaking person.
Original: Roosevelt was responsible for the eventual establishment , in 1964 , of the 2,800 acre ( 11 km2 ) Roosevelt Campobello International Park on Campobello Island , New Brunswick , Canada .
Simplified: In 1964 , Eleanor Roosevelt helped in founding of the 2,800 acre Roosevelt Campobello International Park on Campobello Island , New Brunswick .