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The phrase "are difficult and often" is correct and usable in written English.
It can be used to describe something that presents challenges and occurs frequently in a particular context.
Example: "The tasks assigned to the team are difficult and often require additional resources to complete successfully."
Alternatives: "are challenging and frequently" or "are tough and commonly".
Exact(6)
Decisions about anticoagulation are difficult and often frightening for patients, who often have little understanding of the potential risks.
In real life the issues surrounding the reunification of adoptees and birth parents are difficult and often contentious.
She knows that the conditions of their lives are difficult and often harsh, but she does not see these conditions as completely determining.
The bad news is that even if bed bugs don't spread hepatitis or AIDS, they can engender feelings of shame and disgust, and they are difficult and often costly to eliminate.
Both are prepared for; both are difficult (and often thankless); both take hard work and time.
Considering that RCTs are difficult and often unlikely to be carried out for most radiation treatment modalities [ 31], a discussion of what constitutes evidence for complex and evolving technologies, such as IMRT, is necessary to engage physicians at an earlier stage and avoid implementation delays.
Similar(54)
Compromised hardware is difficult, and often impossible, to detect.
Hence, evaluation of RTD in risers from conventional tracer responses is difficult and often not possible.
Travel, even for the young and healthy, was difficult and often dangerous.
Similarly, being a carer is difficult and often overwhelming in the best of situations.
He does as well as he can in school, but math is difficult and often frustrating.
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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