The phrase "after so many efforts" is correct and usable in written English.
It can be used to express a sense of persistence or struggle before achieving a goal or result.
Example: "After so many efforts, we finally completed the project successfully."
Alternatives: "after numerous attempts" or "after many tries".
After so many efforts to adapt Austen, Dickens and the Brontës, the books remain inexhaustible – daunting, dangerous, their words still more vivid than any cinematic image can hope to be.
After so many efforts to appear before the international community as a country transitioning through a process of openings, where does this "sugar missile" piece fit?
If in-ear buds just aren't your style, there is the Sony MDR-1000X headphone, which -- after so many efforts -- finally puts Sony in the big league with brands such as Bose, Sennheiser, and Bowers & Wilkins.
You might be tempted to have sex with anybody and you feel that after so many efforts of resisting, you should give it just one try.
As mentioned above, there are so many efforts to protect wide area power system.
Why are there so many efforts to give these drowning victims a glass of water?
With the broken well dumping as much as 19,000 to 25,000 barrels a day into the Gulf, Admiral Allen said that engineers hope to gradually increase the amount of oil captured into a ship hovering on the sea's surface without jeopardizing the delicate recovery effort after so many other efforts have failed in the last six weeks.
Obama said he recognised the depths of passions and mistrust and that the task would be difficult after so many failed efforts.
Should we believe in the cause of liberal democracy – or is it time to shed what many, after so many botched efforts, see as the last, doomed western obsession with remaking the world in its distorting image?
Mr. Annan and the African leaders here are clearly skeptical that the developed nations would follow through with their promise of aid after so many failed efforts to help the continent.
