The phrase "a very complex mechanism" is correct and usable in written English.
It can be used to describe something that has many intricate parts or functions, often in technical or scientific contexts.
Example: "The engine operates using a very complex mechanism that allows for efficient fuel combustion."
Alternatives: "an extremely intricate system" or "a highly complicated apparatus."
About $80,000 and a lot of gumption will get you this De GRISONOGO Otturatore watch that uses a very complex mechanism for mechanically cycling through its various dial functions.
The drone is "a very complex mechanism that is really a whole bunch of different things: sensors, its own code, motors, mechanics, and electronics.
This points at a very complex mechanism and possible involvement of multiple factors in the immunopathology of HCB.
The diversity of the explanations for the effect of RTKs on tamoxifen resistance may suggest a very complex mechanism behind the anti-estrogen resistance.
These responses are likely GC dose and duration of exposure-dependent, and the results suggest a very complex mechanism that is initiated by GC-GRα interactions.
Cellular Cho levels, tightly regulated by a very complex mechanism, result from the balance of three major processes: de novo synthesis, internalization of exogenous Cho, and the efflux of excess Cho (van der Wulp et al., 2013).
The mechanism by which CTGF enables persistent fibrosis upon stimulation by TGFβ has never been elucidated, due at least in part to the very complex mechanism of action (MOA) of CTGF.
Histone modification is a very complex epigenetic mechanism that so far has not been decoded [ 70- 72].
We can speculate that through its binding to Hsp70, BAG3 might also positively or negatively modulate folding of other apoptosis-regulating proteins, and expect that future research will disclose a very complex regulative mechanism mediated by this protein.
The shear behavior of the SFRPSC members results from very complex mechanisms, and the local behavior at the crack surface of SFRPSC beams is very difficult to understand.
Most binding occurs at distant regulatory elements, suggesting very complex mechanisms of transcriptional regulation [ 59].
