The phrase "are difficult to accomplish" is correct and usable in written English.
It can be used when discussing tasks, goals, or objectives that require significant effort or are challenging to achieve.
Example: "Many of the goals set for the project are difficult to accomplish without proper resources and support."
Alternatives: "are hard to achieve" or "are challenging to complete".
In other words, the tracking function in [19] is fixed; improvements or the addition of new functions are difficult to accomplish.
While there are existing tools, most of them are difficult to accomplish and require extensive data gathering, thus are not utilized enough by MPA managers in the country.
Even if those dreams are difficult to accomplish, the technology built along the way could radically change our drug pipeline, and that will provide relief for all kinds of diseases.
Direct tests of genetic adaptation are very effective in establishing a concrete, and potentially deleterious population-level effect of contaminant exposure, but they are difficult to accomplish with most field-exposed organisms.
We might have fallen into this mind trap at some point: we need a vacation from our exhausting work and doing what you love efficiently and travelling are difficult to accomplish.
This could imply that changes in these areas are difficult to accomplish within a two-year period.
But a transition totally free of tumult may be difficult to accomplish.
"When there's not a profit motive or profit-loss mentality in government, it's difficult to accomplish these objectives".
These days, being still and letting the story reveal itself is difficult to accomplish and increasingly rare.
The challenge of "creating a generalist voice that will speak for an age of specialization," he said, was "difficult to accomplish, but it is important to try".
Mr. Dinkins said he found integration was difficult to accomplish because the city lacked a residency requirement, and thus white men from the suburbs dominated each academy class.
