Simplify the following text for a Grade 7 native English-speaking person.
Original: While in college he emigrated to the United States and graduated with a bachelor 's degree at Miami University , a master 's at the University of Pittsburgh , and a Ph. D. at University of Pennsylvania by age 25 .
Simplified: He graduated from Miami University . Lee received a master degree from the University of Pittsburgh , and his Ph. D. from the University of Pennsylvania at the age of 25 .