The phrase "alleged that while" is correct and usable in written English.
It can be used when introducing a claim or assertion that something occurred during a specific time or situation.
Example: "The report alleged that while the company was aware of the issues, they failed to take appropriate action."
Alternatives: "claimed that during" or "asserted that while".
The indictment alleged that, while giving answers to questions on her U.S. citizenship application in 2004, she did not disclose her arrest by the Israelis in Palestine from almost 40 years earlier.
One report on the Square Bird alleged that "while smooth and comfortable for freeway travel, it is not particularly maneuverable.
Mr. Emanet alleged that while his visa reflected his promised salary, $44,000, he was actually paid $28,000 his first year.
The student alleged that while discussing her work with Walcott after class, he asked her to "imagine me making love to you.
Steele's memo also alleged that while Page was in Russia he met with a top Kremlin official, Igor Diveykin, who floated the idea of leaking Russian kompromat on Clinton, in order to boost Trump's candidacy.
Bishop Daily has drawn increasing scrutiny since January, when lawsuits filed in Boston alleged that while he was an auxiliary bishop there, he was aware of large-scale abuses by a priest, John Geoghan.
Specifically, the complaint alleges that while in possession of information indicating that the company's third-quarter 2000 would produce disappointing results, defendants told analysts that the company's third-quarter 2000 projections were on track to meet consensus estimates".
Mr. Trump alleged that Hillary lacked stamina while he accosted reluctant women while married to his statuesque Melania, a former model.
The case involved a lawsuit by his onetime legal advisor, Minakshi Jafa-Bodden, who alleged that Choudhury sexually harassed her while she worked for him and that she was fired after she began investigating claims that he had raped a yoga student.
"Some reports allege incidents occurred while merging into high speed traffic and others allege that incidents occurred while turning left across oncoming traffic," said a notice posted to the safety agency's Web site over the weekend.
He alleges that, while inside the vehicle and surrounded by other officers, he was assaulted, his head pushed against the van window.
