Phrase for something that takes a very long time and a lot of resources to understand

Question

I want to paraphrase this sentence into something smaller - "Laypersons cannot understand findings from papers in this field, no matter how much time they spend. To understand them, experts are required and the process may require sizeable resources and time"

I thought of something like "Findings from these papers are resource-intensive and temporally incomprehensible to laypersons." but I know it's wrong. What kind of phrase can I use to describe the nature of the process of "understanding findings from papers"?

Answer 1

'These papers are esoteric' will convey all you require, I believe.

intended for or likely to be understood by only a small number of people with a specialized knowledge or interest.

Google Dictionary

Esoteric : Designed for, or appropriate to, an inner circle of advanced or privileged disciples; communicated to, or intelligible by, the initiated exclusively

OED-3

An esoteric doctoral thesis is not the sort of thing you’d bring up at Thanksgiving dinner. One doesn’t chitchat about prosthetic heart valves in the supermarket checkout line or dive into mathematical representations of braids on a blind date.

Wall Street Journal