"previously acknowledged that" is a grammatically correct and commonly used phrase in written English, and it can be used to acknowledge that you are aware of something that has previously been mentioned or accepted.
For example, you could write, "As was previously acknowledged, the answer to this problem requires careful consideration."
Strauss-Kahn's New York attorneys had previously acknowledged that talks had taken place.
Morris has previously acknowledged that "some may find poking fun at terrorists offensive".
(Mr. Thibodeau's lawyer had previously acknowledged that Mr. Thibodeau did send the emails).
Federated had previously acknowledged that employees had processed trades after hours for one hedge fund, Veras Partners.
Pakistani officials previously acknowledged that the 2008 attacks were partly planned on their soil by Pakistani extremists.
Mr. Bush has previously acknowledged that his daughter has a drug problem, and he has at times become emotional talking about it.
Announcing the judicial review proceedings against the IPCC, a spokesman for the Police Federation said on Sunday that the watchdog had acted unlawfully and the decision to reinvestigate came "despite the IPCC previously acknowledging that it could not take this course of action".
"This was despite the IPCC previously acknowledging that it could not take this course of action".
The World Health Organisation said last year that the world needs more than 7 million skilled healthcare staff, and has previously acknowledged (pdf) that community health workers, if trained and adequately resourced, can be a valuable asset in improving access to and coverage of basic health services.
Rösler acknowledged that was that.
These observations suggest that expression of homing markers may be more complex than previously acknowledged, and that studies of T-cell homing should take coexpression of these makers into account, especially while inflammation is present at the site of infection or vaccination.
