The phrase "and when he requested" is correct and usable in written English.
It can be used to introduce a clause that describes a specific action taken by someone in response to a request.
Example: "The committee agreed to the proposal, and when he requested additional funding, they were happy to accommodate."
Alternatives: "and upon his request" or "and at his request".
So, Jefferson lied to France, England, and Spain when he requested passage for a "scientific" expedition through their territories.
Trump said he was originally flummoxed by the press' reaction to his comments, and that when he requested a transcript, he realized he'd made a critical mistake.
I saw him three times in the past six years: first at my grandmother's wake, second at my grandfather's birthday, and third when he requested I drive him to my grandpa's house in his ex-wife's car.
I saw him three times in the past six years: First at my grandmother's wake, second at my grandfather's birthday, and third when he requested I drive him to my grandpa's house in his ex-wife's car.
He had a valid passport and visa, but when he requested political asylum, he was arrested and taken to the Krome detention center in Miami.
Coey received United States Marine Corps officer training during his studies and was on track to receive a commission when he requested discharge and left for Rhodesia, believing that the U.S. government had been infiltrated by a "revolutionary conspiracy of internationalists, collectivists and communists" and that fighting for Rhodesia would allow him to better defend Western interests.
For example, he recalls companies returning his registration fees for training workshops when they found out he was deaf because they felt they wouldn't be able to accommodate his needs, and job interviews being canceled when he requested interpreting services.
She sang a blues number for him anyway, and when he later requested "Ain't No Mountain High Enough," she relinquished the microphone to her daughter Marie, 8, who belted out the song with enthusiasm, for the biggest applause of the night.
