This is the 12112th most frequent Russian word.
изменился
"Changed" or "has changed."
The word 'изменился' is used to describe a change or transformation undergone by the subject 'Мир' (the world).
Мир сильно изменился за последние десятилетия.
The world has changed significantly over the past decades.
Here, 'изменился' refers to a personal, internal transformation of the subject 'он' (he).
С тех пор, как он уехал, он сам изменился.
Since he left, he himself has changed.
In this sentence, 'изменился' indicates a physical or external change affecting the appearance or state of the subject 'дом' (the house).