The phrase "are very complex for" is correct and usable in written English.
It can be used when describing something that is difficult to understand or deal with for a particular subject or audience.
Example: "The mathematical concepts presented in this course are very complex for beginners."
Alternatives: "are quite complicated for" or "are highly intricate for".
On the other hand, the regions containing vibrations associated with speech are very complex for reconstruction, and thus we observed the highest MSEs in these regions.
They fed in a synopsis of Lord of the Rings and the AI was able to answer some questions that look straightforward for us, but are very complex for a computer to answer.
In the study of complex phenomena we can understand why the human pathologies are very complex, for the various mechanisms in action and for the casual relationships among different in the components immune system.
Management of these behavioral disorders is very complex for institutions, and few satisfactory solutions have been put forward.
Yet, internal facies architecture is very complex for both wave- and fluvial-dominated deltas due to the interaction of several competing sedimentary processes.
It can be very complex for some people to take the first step". Amar Latif, a blind entrepreneur and former Stelios award winner with his tour company, Traveleyes, agrees.
Although the language of distribution may be very complex for students to absorb in fourth grade alongside variation, slowly students should develop the notion suggested by Wild (2006) that distribution is 'the lens through which statisticians look at the variation in data' (p. 10).
It's very complex for everyone involved and isn't ideal for any of us.
In this literature, the causes of constrained evolution are often unclear, because the relationship between genotype and phenotype is very complex for the macroscopic traits that development creates.
Onlay preparations are very complex surfaces for computer surface digitization, CAD, and CAM of all-ceramic onlay cores.
