Complex sentence: At the beginning of 2014, Griffin made a $150 million donation to the financial aid program at Harvard University, his alma mater, the largest single donation ever made to the institution at the time.
Split into simpler sentences: At the beginning of 2014, Griffin made a $150 million donation to the financial aid program at Harvard University, his alma mater. The donation was the largest single donation ever made to the institution at the time.