Simplify the following text for a Grade 14 native English-speaking person.
Original: In 2008 , researchers at Tufts University uncovered what they believe is the world 's oldest known full-body impression of a primitive flying insect , a 300 million-year-old specimen from the Carboniferous Period .
Simplified: In 2008 , researchers uncovered what they believe is the world 's oldest known full-body impression of a primitive flying insect , a 300 million-year-old specimen from the Carboniferous period .