Simplify the following text for a Grade 9 native English-speaking person.
Original: Considered to be the world 's foremost expert on chimpanzees , Goodall is best known for her 45-year study of social and family interactions of wild chimpanzees in Gombe Stream National Park , Tanzania .
Simplified: She is the world 's foremost expert on chimpanzees . Goodall is best known for her 45-year study of social and family interactions of wild chimpanzees in Gombe Stream National Park , Tanzania .