The phrase "and has done enough" is correct and usable in written English.
It can be used to indicate that someone has reached a satisfactory level of effort or achievement in a particular context.
Example: "After years of hard work, she feels that she has done enough to secure her position in the company."
Alternatives: "and has contributed sufficiently" or "and has fulfilled their obligations".
Waddell has gone back on medication and has done enough to prove he will be fit enough to challenge for medals.
His prime minister, Salam Fayyad, is very serious and has done enough on the West Bank to prompt a World Bank statement this week saying: "If the Palestinian Authority maintains its current performance in institution-building and delivery of public services, it is well-positioned for the establishment of a state at any point in the near future".
"He's been with us since the summer and has done enough to earn a short-term deal, which is effectively an extended trial," said manager Martin Ling.
"I thought we were the better side in the first half and had done enough to be in the lead, but it is true that I was disappointed with the second half," Moyes said.
We get to a point where we think we are doing well and have done enough and it's got to stop.
We've shown that we can be competitive at the front of MotoGP and have done enough to be in a factory team or on a factory bike at least.
They were unconvinced, especially Carol who, most likely, was more interested in her burgeoning romance with Ezekiel and, anyway, has done enough killing for one lifetime.
And she demonstrates, too, that he has done enough excellent work to be forgiven his failures.
But hopefully I showed a few glimpses, and I've done enough in this game to possibly play in Hobart and force another claim for the Test selection".
Obama will have lifted Democratic morale and may have done enough to slow – or even arrest – the crisis.
Koike needs such voters to help break down the establishment vote machine and may have done enough to swing the vote in her favour.
