Simplify the following text for a Grade 12 native English-speaking person.
Original: Max Born ( 11 December 1882 -- 5 January 1970 ) was a German-born physicist and mathematician who was instrumental in the development of quantum mechanics .
Simplified: Max Born ( December 11 , 1882 â `` January 5 , 1970 ) was a German physicist and mathematician who was important for the development of quantum mechanics .