His whole personality had undergone a subtle change.

Brennan's personality undergoes significant changes throughout the course of the series.

But the personality which that self once possessed underwent a deep change, and you feel as if you've been reborn into a new person.

His personality however underwent a minor change in season 10, but he still remains a kind and sensible engine.

When Shawn returns, his personality undergoes a profound change.

In the final stages the hacker's personality undergoes a fundamental change.

Her personality had undergone some drastic changes since that morning in Virginia.

In times of crisis, he focuses intensely on the challenge as if his personality had undergone an astonishing change.

His personality was undergoing, even if only for a short while, a sea change-and all because, at long last, he had something valuable to do.

Jane's personality has undergone a dramatic change since the death of his family.