The phrase "sufficiently able to" is grammatically correct and can be used in written English.
It is typically used to describe someone or something's capability or competence in performing a certain action or task. Example: The new employee was sufficiently able to handle the complex project without any assistance.
There is disagreement about whether long-term memories eventually become independent of the hippocampus, with the cortex being sufficiently able to support recall.
In my own work, I sought to combine clarity about Nazi doctors' moral responsibility for what they did with nuanced representations of them, including psychological conflicts that, unfortunately, most were sufficiently able to overcome to go on with their killing.
The students were sufficiently able to apply concepts from the instructional unit: the average score was 64%.
The renewable energy development actors in Oman have not been sufficiently able to move beyond these learning dimensions.
In the case of long-lasting insufficiency, the kidneys are not able or are not sufficiently able to purify the blood of the breakdown products of the protein metabolism (amongst others urea, creatinine and uric acid).
Ziegler is sufficiently able to embarrass himself without producers having to work at it.
3) This training will not sufficiently be able to focus on an (individual) appropriate level of difficulty.
Hillary Clinton is a sufficiently able student of history to know that when unions led a national movement calling for an 8-hour work day, a minimum wage, or the right to organize, all of these policy goals required state legislatures to act.
Creditors are entitled to ensure that borrowers reform their economies sufficiently to be able to pay back what they owe.
The US leader recovered sufficiently to be able to keep his appointment with Sarkozy, their first one-to-one meeting, later that day.
In any case, when Steele sent in his first memorandum, which was thirty-five pages long and dated June 20 , 2016 it contained some explosive allegations, including claims that the Russian regime had been carefully cultivating Trump, and that the F.S.B., the Kremlin's domestic-intelligence agency, had "compromised TRUMP through his activities in Moscow sufficiently to be able to blackmail him".
