The phrase "after he is able" is correct and usable in written English.
It can be used to indicate a condition or situation that will occur following someone's ability to do something.
Example: "We will proceed with the project after he is able to secure the necessary funding."
Alternatives: "once he is capable" or "after he can".
Homer tries his hardest to start the car up again, but is eventually forced to take Grampa with them after he is able to reach them.
That's because, not all that long after he is able to legally drink a beer in the U.S., he will have a chance at Augusta National next April to join Nicklaus, Woods, Ben Hogan, Gene Sarazen and Gary Player as the sixth player in history to win each of the four majors at least once.
The Damage Is Done Prosecutors eventually dropped or suspended the charges against Mr. Kurt-Adzhiyev after he was able to discredit them.
Keiran Sorkin said he was delighted after he was able to fulfil his wish of wearing sunglasses for the first time.
A young Thomas Edison was hired to manage a ticker repair operation after he was able to fix the machine at the Gold Exchange.
Yet another possible course Mr. Cheney could take would be to agree to donate the net profits to a charity after he was able to exercise the options.
Mr. Kerrey makes no apologies for trying to capitalize on profitable divisions, especially since the university is heavily dependent on tuition because of its relatively small endowment, even after he was able to double it.
Mahmood was the first to make the link after he was able to contact aid workers in Majeed's camp who confirmed that he had apparently disappeared to join a militia.
Four minutes from time, Jason Scotland had a chance to win the match for Barnsley but his shot could only find the side-netting after he was able to control Tom Kennedy's deep free-kick and find space in the penalty area.
At Armageddon, Michaels defeated Kennedy after he was able to hit Kennedy with Sweet Chin Music.
"It's as though an earthquake has hit," BBC Turkey correspondent Mark Lowen said after he was able to enter Silopi.
