Simplify the following text for a Grade 7 native English-speaking person.
Original: He graduated from Tenafly High School in Tenafly , New Jersey in 1968 , and then studied at Harvard University where he received his A.B. and Ph. D. .
Simplified: He graduated from Tenafly High School in Tenafly , New Jersey in 1968 , and attended Harvard University where he received his A.B. in mathematics and Ph. D. in applied mathematics .