The phrase "a complicated process for" is correct and usable in written English.
It can be used when describing a process that is intricate or difficult, typically followed by the subject or purpose of the process.
Example: "Developing a new software application can be a complicated process for inexperienced programmers."
Alternatives: "a complex procedure for" or "an intricate method for".
"It's obviously a complicated process for both sides because of the passage of time," Ms. Semel said.
Knowledge of these properties, however, yields only superficial clues about a compound's molecular structure, and the determination of that structure was a complicated process (for large molecules at least) that involved careful analysis of several reaction pathways.
I was crying every day at work and I had nearly two months off because I didn't want to be there". Investigating a stalking offence can be a complicated process for the police - something that Arabella is aware of.
Surviving a disaster is a complicated process for disabled people, with barriers every step of the way.
The rules we've adopted from all directions would lead us to believe that making up a song should be a complicated process for only the most devoted.
And here is more from the AP: NEW YORK -- Losing 50-plus pounds was a complicated process for 50 Cent - but not an entirely new one.
Democrats said the bill had too little funding for legal representation for the children and teenagers, who are often forced to go through a complicated process of applying for relief without an attorney.
She explained that the bank had invoked a complicated process, blamed her for delays, and charged her additional fees for necessary changes.
We found that these meetings provided a window into a complicated process where others--for different reasons--had been working on similar issues for many years.
It simplifies a complicated process, and streamlines it for mass media consumption.
In our research report, the author suggests a more complicated process for stranding based on some mix of HDI, historic benefit from fossil fuels and alternative development options.
