The phrase "acknowledged that efforts" is correct and usable in written English.
It can be used when recognizing or admitting the attempts or work put forth by individuals or groups in a particular context.
Example: "The committee acknowledged that efforts made by volunteers were crucial to the success of the event."
Alternatives: "recognized the efforts" or "admitted the attempts".
But all acknowledged that efforts to atone for grievances committed are too little too late.
But she acknowledged that efforts in recent months to recruit candidates had been only partly successful.
Mattis acknowledged that efforts to reconcile with the entire Taliban have been difficult.
But Mr. Maldonado acknowledged that efforts to keep hydrants shut would depend on the city's ability to eradicate a long-cherished summer practice.
The next day, at a meeting with executives in Houston, Mr. Angelle acknowledged that efforts to assist the industry could be hampered if safety problems persisted.
While Trump has been eager to hold a second summit with Kim, on Wednesday the US vice-president, Mike Pence, acknowledged that efforts to persuade North Korea to give up its nuclear arsenal had not made headway.
The south, though remains besieged, with diplomats in Irbil and senior Kurdish officials acknowledging that efforts to clear the road of jihadists has failed.
President Francesco Cossiga, acknowledging that efforts to name a new government were deadlocked, appointed a mediator today to untangle deepening political disputes over who should succeed Bettino Craxi as Prime Minister.
Those who are working on their skills say employers don't acknowledge that effort: 46% say their company doesn't value employees who are technologically savvy.
Austin could not publicly acknowledge that effort, and neither could the senators questioning him, but others who follow the Syrian civil war helped set the record straight: .
But he acknowledges that efforts to bring the favelas back into mainstream society remains a work in progress.
