'transformative period' is a correct and usable phrase in written English.
You can use it to describe a time frame during which something has undergone a significant change or transformation. For example, "The company experienced a transformative period following the introduction of new technology and processes."
But change is necessary during this transformative period".
The early 21st century was a tumultuous yet transformative period in Nepal's governmental history.
His return this year, Mr. Gee said, closes the loop on a transformative period in the university's history.
Sadly, that's not happening so much now, because people can't afford it, but often that was a transformative period.
He was appointed chief executive in 2004, overseeing a transformative period when Lego's losses turned into profit and revenue increased five-fold to 35.8bn kroner (£4.1bn) in 2015.
Every truly transformative period in the past century — the Progressive Era, the New Deal, the conservative counter-reformation — was driven by a President, never by Congress.
The New York Law School community mourns the passing of John V. Thornton, former chairman of the Board of Trustees who led our school through one of its most transformative periods in the 1970's and 1980's.
In her five years as chief executive of Canada's largest stock market, she shepherded the bourse through one of the most transformative periods in its 150-year history.
"I liked writing about teens because a lot of things are new … it's one of the most transformative periods of one's life," Franco, who also stars in the film, said on the red carpet Monday.
One of the most transformative periods in my faith was when I took time to re-read the Gospels of the New Testament and get reacquainted with Jesus' himself, in his own words.
When I first started writing for Model Behaviors, I'd recently gone through a breakup, which forced me into one of the most transitional and transformative periods of my life.
