In the sentence "He manages change" change is a noun.
Another way to put it in English is "He manages the changes"
"He manages change" would be "Dia berhasil ubah" I believe.
"berubah" means "to change" it's a verb. It's the act of changing.
For example "He changed into a dog" would be "Dia berubah ke anjing" I believe.
I say I believe because I'm not a native speaker.