Simplify the following text for a Grade 10 native English-speaking person.
Original: Abbot Howard `` Abbie '' Hoffman ( November 30 , 1936 -- April 12 , 1989 ) was a political and social activist who co-founded the Youth International Party ( `` Yippies '' ) .
Simplified: Abbot Howard `` Abbie '' Hoffman ( November 30 , 1936 â `` April 12 , 1989 ) was a social and political activist in the United States .