"confirmed that while" is a grammatically correct and usable phrase in written English.
It can be used to introduce a statement that explains the circumstances behind an existing situation or fact. For example, "The historian confirmed that while the area had always been populated, it experienced a period of rapid growth in the 20th century."
Officials confirmed that while the new count will be expanded, it will remain in effect voluntary.
It also confirmed that, while it is bleeped out in the footage, the term he used was a racist slur.
"Medical experts have confirmed that while perhaps slight, a decision to compete in Rio absolutely comes with health risks to me and to my family.
Last Sunday The Times confirmed that while the world's attention was focused on Najaf, western Iraq fell firmly under rebel control.
But she confirmed that while the Chinese were "very satisfied with the business results" of the fair, "they don't really feel they were welcomed as guests here".
The CIA later confirmed that, while it had not supported the coup, it had "actively supported the military junta after the overthrow of Allende".
VATICAN CITY (The Borowitz Report) — The Vatican has confirmed that while Pope Francis was in Washington, he had meetings with people who refuse to do their jobs.
And Mr. Chazen confirmed that while the move to replace him wasn't his choice, he will continue to serve as chief executive until his successor is found.
The governing body also confirmed that while he can appeal the decision, the ban will start immediately, meaning Suarez's World Cup is over.
My interviewees confirmed that while hospitals historically took an adversarial and secretive approach to lawsuits and error, that has begun to change.
Col-Gen Muzhenko confirmed that while a ceasefire has largely held since 29 August, reconnaissance groups have remained active along the front lines.
