'concluded the work' is correct and usable in written English.
You can use it when you have accomplished a task. For example, "After hours of work, Sally concluded the project."
It took five years of fruitless trying before Columbia concluded the work could not be adapted in two-hour form.
The meeting concluded the work of one of the first boards of education in a major city to answer to a mayor.
We have concluded the work on a legal act that has given rise to various emotional reactions: the Act on shale gas.
Indeed, the independent House of Commons DWP select committee took a close look and concluded the Work Programme was actually a third smaller than the plans Labour had in place to get our country back to work.
End summary and recommendation 2. (U) On May 5, PM Berlusconi briefed the Chamber of Deputies and the Senate on the Italian and US reports that concluded the work of the joint investigation in to the March 4 shooting of Italian Intelligence officer Nicola Calipari by US forces near Baghdad.
RJ comprehended, devised the scheme, performed, and concluded the work.
The brief speech concluded the working portion of the trip; the big question on Saturday morning here was what the Obamas would do for fun.
NIH should retire most of the research chimps and reduce its research supply to a single colony of just 50 chimps within 5 years, concluded the working group.
Mr. Li confidently nailed the cascade of prestissimo octaves that conclude the work.
The same theme concludes the work where it blasts out almost jeeringly at menacing full tone.
It takes many weeks of very long days, evenings and weekends to conclude the work.
