Simplify the following text for a Grade 9 native English-speaking person.
Original: He was awarded the 2001 Nobel Prize in Physiology or Medicine , with Leland Hartwell and Timothy Hunt , for their discoveries about cell division .
Simplified: He was awarded the 2001 Nobel Prize in Physiology or Medicine with Leland H. Hartwell and R. Timothy Hunt for their discoveries regarding cell cycle regulation by cyclin and cyclin dependent kinases .