The phrase "a difficult process that" is correct and usable in written English.
You can use it when describing a challenging procedure or series of steps that need to be taken in a particular context.
Example: "Learning a new language can be a difficult process that requires dedication and practice."
Alternatives: "a challenging procedure that" or "a tough task that".
Growth is a difficult process that requires deliberate practice.
Hodgson knows it will be a difficult process that could threaten his working relationship with various players.
He oversaw the closing of two prisons, a difficult process that can reverberate across communities that depend on the associated jobs and state money.
The circulatory system must also be flushed with an anticoagulant immediately after the heart stops and the organs removed within minutes, a difficult process that is rarely attempted in China.
If she does not get 25percentt of the delegates' votes, she can get on the ballot only by collecting tens of thousands of signatures, a difficult process that can cost more than half a million dollars.
A big advantage of bankruptcy over government-subsidized modifications is that bankruptcy is a difficult process that does not entice anyone to purposely default in order to get better repayment terms.
This project was part of our larger efforts to make more media types embeddable in Rubenstein collection guides, a deceptively difficult process that will likely be covered more in depth in a future Bitstreams post.
It's a hugely difficult process that often takes years, but we try to help them.
Healthy grieving can be a slow, difficult process that lasts for months or years.
It has the potential to be the start of a lengthy, difficult process that has been contentious in many communities.
All the progress in gay rights that has been achieved has only taken place in the context of liberal democracies, and it has been a very difficult process that is still unfinished.
