Simplify the following text for a Grade 10 native English-speaking person.
Original: While doing summer work in 1982 at the Marine Biological Laboratory at Woods Hole , Massachusetts , using the sea urchin ( Arbacia punctulata ) egg as his model organism , he discovered the cyclin molecule .
Simplified: In 1982 at the Marine Biological Laboratory at Woods Hole , Massachusetts he used the sea urchin ( Arbacia punctulata ) egg as his model organism . He discovered the cyclin molecule .