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The phrase "are sometimes difficult to" is correct and usable in written English.
You can use it when discussing situations or tasks that may not always be easy to accomplish or understand.
Example: "These concepts are sometimes difficult to grasp for new students."
Alternatives: "can be challenging to" or "may be hard to".
Exact(60)
Weekend reservations are sometimes difficult to snare.
"Other people's motivations are sometimes difficult to predict".
THE demographics of Asia's large countries are sometimes difficult to wrap one's head around.
Black soils tend to have a markedly crumbly structure and are sometimes difficult to plow.
It's only through stories that we understand issues that are sometimes difficult to comprehend.
We act in ways that are sometimes difficult to detect by simple introspection.
Over the years, Ms Janis said, fans have passed along much weightier messages that are sometimes difficult to hear.
Because mobile Internet connections are sometimes difficult to make indoors, some of the services download their maps onto users' phones when they first check in on the service.
These aspects of Lemebel's work are sometimes difficult to read, because they transgress so flagrantly the standards of good taste in the age of gay marriage.
Balsams are sometimes difficult to distinguish from oleoresins, which are resins dissolved in essential oils, but usually the oleoresins are slightly more fluid.
Genetic diseases are sometimes difficult to explain, and people there are often unwilling to accept that both parents' genes are equally responsible for the disease.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com