The phrase 'became transformed' is correct and usable in written English.
You can use it to describe the process of a thing or person changing in a significant way. For example: "After going through a difficult period, the once timid boy became transformed into a confident young man."
The Incas had a multitude of dishes with indigenous ingredients that became transformed during this melding of cultures.
Through that fellowship, they became transformed, not only in what they believed about the issue but also in what they believed they could do.
Occasionally in this century, there were moments when the kaleidoscope of change was shaken so violently that the world of books became transformed.
So the project became transformed, into what will be if completed a comprehensive look at a civilization that took root more than 3,500 years ago.
Guevara was a more doctrinaire ideologue than Castro and a fervent critic of "material incentives" but in death he became transformed into an icon of daring and rebellion.
Things began to go astray when the temporary management of menopausal symptoms became transformed into a belief that ovarian failure was itself a treatable risk factor for other dread conditions, just as elevated cholesterol or blood pressure was.
Thus, lhen plasmin was present 3T3 cells did not become transformed, but expresses transformation-like features.
When the experience is taken in and internalized, it becomes transformed into your inner life.
This twining tendril becomes transformed at its tip into a pitcher that is held upright.
The lamb, marinated briefly in this paste along with the spices, becomes transformed.
In other words, he gradually becomes transformed into someone nearly unrecognizable.
