The phrase "formerly trained" is correct and can be used in written English.
It is typically used to describe someone who has received previous training in a specific skill or field. Example: The company hired a team of formerly trained engineers to work on their new project.
Intelligence agents say they include members of Jaish-e-Muhammad, a Pakistani outfit formerly trained by the army to fight in Indian-held Kashmir.
Golden Flight, age 10, weight 10-11 Formerly trained in France, near La Rochelle, and was capable of winning at the highest level there.
Formerly trained on the Flat here by Marcus Tregoning, Wikaala appreciated faster ground on his latest hurdles run at Downpatrick when finishing second in a maiden hurdle.
His "team" - his manager Simon Dent - works for next to nothing; his coach, Daniel Plummer, an ex-sprinter who formerly trained his old rival Darren Campbell, was not granted a pass for these games and had to pay his own easyJet flight out.
The 19-1 shot, formerly trained in Britain by Harry Dunlop, triumphed from Fiorente and Jakkalberry.
Hot Snap is a half-sister to star mare Midday, formerly trained by Cecil, who was confirmed as being in foal to Frankel on Tuesday.
Formerly, we were trained to concentrate on one task, like a factory worker.
We already know what happens when formerly armed and trained national security forces suddenly face unemployment: they join militias and end up fighting each other or us.
Eurasian brown bears are commonly seen in zoos; formerly they were often trained to move rhythmically to music the so-called dancing bears of European carnivals and festivals.
In Myanmar, formerly Burma, biologists and trained local workers are conducting the first survey of wildlife in some of the world's most remote forests as part of a government effort to decide where to place new preserves and parks.
Historically, South Africa and Zimbabwe had close links and several key South African researchers and malaria control officers had been trained, and formerly held positions, at the Blair Research Institute in Harare - an important regional malaria research institution.
