Simplify the following text for a Grade 7 native English-speaking person.
Original: Otto Heinrich Warburg ( October 8 , 1883 , Freiburg im Breisgau -- August 1 , 1970 , Berlin ) , son of physicist Emil Warburg , was a German physiologist , medical doctor and Nobel laureate .
Simplified: Otto Heinrich Warburg ( October 8 , 1883 - August 1 , 1970 ) was an German chemist .