Simplify the following text for a Grade 7 native English-speaking person.
Original: He personally chose three female researchers , Jane Goodall , Dian Fossey , and Birute Galdikas , who were later dubbed ` Leakey 's Angels ' and each went on to become important scholars in the field of primatology .
Simplified: He chose three female researchers : Jane Goodall , Dian Fossey , and Birute Galdikas . They were dubbed ` Leakey 's Angels ' .