The phrase "are exceptionally complex" is correct and usable in written English.
It can be used to describe something that is very intricate or difficult to understand.
Example: "The theories presented in the paper are exceptionally complex, requiring a deep understanding of the subject matter."
Alternatives: "are highly intricate" or "are remarkably complicated."
With each successive move, there is a growing sense that it is only a matter of time before they break loose.The rules of the pact are exceptionally complex, but the principles are simple.
We see then that the perception of expertise and the trust of communities are exceptionally complex, even in relationship to a single issue.
HSP responses in human autoimmunity are exceptionally complex [10], [33] and are likely the result of a dynamic balance between self and non-self recognition in the context of apparently contradictory proinflammatory and tolerogenic signals [14], [34].
The biochemical response pathways invoked by sub-lethal copper concentrations are exceptionally complex; though integral cellular functions are preserved, in part, through the coordination of defense enzymes, chaperones, antioxidants and protective osmolytes that likely help maintain cellular redox.
Natural products often used as enhancers are exceptionally complex in terms of their chemistry.
It should be noted that the mechanisms of tumor lymphangiogenesis and lymphatic metastasis are exceptionally complex, and the exact role of SIRT1 protein in lymphangiogenesis and lymphatic metastasis remains to be further studied.
This sounds utopian – and it certainly would be exceptionally complex to negotiate and implement.
The situation with the Guantánamo detention facility is exceptionally complex and releasing any records will further complicate ongoing actions".
The 1050's onscreen menu hierarchy is exceptionally complex, and the controls you use to fine-tune other image settings are challenging to navigate even with bare hands.
Naively, they figured it would take only a year or so, but protein C turned out to be exceptionally complex.
The relationship between substance abuse and violence however, is exceptionally complex and moderated by a host of factors in the individual and the environment.
