Simplify the following text for a Grade 9 native English-speaking person.
Original: According to Nobel 's will , the Karolinska Institutet in Sweden , a medical school and research center , is responsible for the Prize in Physiology or Medicine .
Simplified: The Nobel Prize in Physiology or Medicine is one of many Nobel Prizes which were created by Alfred Nobel . This award is given by the Karolinska Institutet , which is a major medical center in Sweden .