The phrase "a difficult process that involves a" is correct and usable in written English.
You can use it when describing a complex procedure or task that requires certain actions or elements to be completed.
Example: "Learning a new language can be a difficult process that involves a lot of practice and dedication."
Alternatives: "a challenging procedure that requires a" or "a complex task that entails a".
Monetizing consumer web and mobile products is often a long and difficult process that involves understanding the needs of the user community and then explaining value to brand advertisers (if you take an ad-based approach).
Assigning levels to the 86 pathogens on the short-list was found to be a difficult process that required several iterations involving literature studies and evaluation by pathogen-specific experts.
The failure to timely refer patients to district hospitals is the end-point of a difficult decision-making process that involves the health centre nurse, but also the patient and the community.
It's a process that involves first making a paper pattern that the tailor marks up for details, such as button holes and trouser cuffs; and then, for particularly difficult fits, creating a sample suit from scrap fabric.
It's difficult to find legal representation and build a case for asylum -- a process that involves gathering evidence -- while in detention, he said.
Destroying the chemicals is a difficult and potentially hazardous process that involves burning them in extremely hot furnaces or injecting them with new chemicals that neutralize the toxicity.
Culture change is an on-going and evolving process that involves the difficult work of critically re-examining the language, values, assumptions, attitudes, practices, approaches and policies embedded within an organization (Fagan, 2003; Misiorski & Rader, 2010; Pioneer Network, 2013).
The assessment process involved modeling the buy or built scenarios using some good old-fashioned spreadsheeting, says Widrich — a "very difficult" process that inevitably involved a lot of guesstimates and extrapolation.
However, this model is difficult to solve because it is based on the Quasi-Birth-Death process (QBS) and Matrix Analytical Scheme MASS) [10] that involves a large number of matrix operations and iterative in nature.
