The phrase "also learned that during" is correct and usable in written English.
It can be used when discussing information or insights gained over a specific period or event.
Example: "In my research, I also learned that during the 19th century, many social reforms were initiated."
Alternatives: "also discovered that throughout" or "also found out that during".
In the second season, which ended on Tuesday night, we also learned that during those days Peter Chris Nothh) slept with a young investigator in his office who went on to work at Lockhart Gardner and befriend his wife.
The BBC has also learned that during negotiations to provide a loan to the club last month, which would have prevented the need to hold the open offer, Ashley sought control of Rangers' trademark rights.
Roberson also learned that during the 1992 Final Four, Fisher made two of the limited supply of team rooms available to Martin.
To make matters worse, this week we also learned that during the lead-up to the 2016 election, Facebook accepted political ad money from 470 troll accounts that appear to trace back to a company with ties to the Kremlin.
The jurors also learned that the defendants were shackled during the trial, a fact the court tried to conceal with a cloth to preserve the presumption of innocence.
The Legislature also learned that blacks had voted heavily during the first week of the 17-day early-voting period, particularly so on Sundays.
In Missouri, for example, when the media uncovered the identity of the state's lethal injection supervisor, they also learned that he had confused dosages during executions and had lost his privileges to practice in two hospitals.
Claire also learned that her husband was seeing prostitutes during his business trips.
And since then, we've also learned that Stone kept in regular contact with Trump during the 2016 campaign — often via late-night phone calls.
He also learned that his Irish grandfather, James O'Neill, had been jailed in Ireland during the same war, a member of the Irish Republican Army.
