The phrase "a significant and complex" is correct and usable in written English.
It can be used to describe something that has considerable importance and involves multiple intricate elements or factors.
Example: "The research presented a significant and complex challenge that required extensive collaboration among experts from various fields."
Alternatives: "a major and intricate" or "an important and multifaceted".
"Canada's economy is undergoing a significant and complex adjustment".
More and more evidences have demonstrated that macroautophagy plays a significant and complex role in COPD pathogenesis [93, 94].
Human elephant conflict (HEC), in particular crop-raiding, is a significant and complex conservation problem wherever elephants and people occupy the same space.
We excluded one-parent households because it has been proven that a significant and complex association exists between family structure in particular, that of children in non-intact families and the nest-leaving of young adults.
Yet in an information landscape defined by growing volume, higher velocity and an increasing variety of formats and sources, managing information well is a significant and complex challenge to businesses everywhere, regardless of their size or sector.
They realized that while homelessness is a significant and complex issue, keeping somebody warm was within their power.
Most importantly, the zone of hybridization is much larger yet patchier than previously described (Little 1969) and represents a significant and spatially complex region.
Glycosylation of proteins is a biologically significant and complex post-translational modification associated with membrane and secreted proteins.
Sexual exploitation and labour Child trafficking in Sierra Leone has become a more significant and complex problem since the decade-long civil war, which ended in 2002, left thousands of children displaced, separated from their families and orphaned.
It would be a disservice to the people of North Carolina who generously funded the construction of the Museum, and who are joined by other visitors from all other US states and numerous other countries, if we were to maintain that showing one organization's film constituted a comprehensive approach to an issue as significant and complex as sea level science".
He added: "It is our view that cybersecurity is a sufficiently urgent, significant and complex activity to warrant increased ministerial attention".
