The phrase "a substantial and complex" is correct and usable in written English.
It can be used to describe something that is significant in size or importance and intricate in nature, often in academic or formal contexts.
Example: "The research presented a substantial and complex analysis of the economic impacts of climate change."
Alternatives: "a significant and intricate" or "a considerable and complicated".
Collecting children's allegations of sexual abuse is a substantial and complex challenge that involves the intervention of many professionals.
To do so I was forced to first launch a forest management program, which really brought home the fact that collecting biomass to generate a meaningful amount of energy is, in itself, a substantial and complex task.
"This is a substantial and complex undertaking, subject to risk and addressing a number of issues, of which the most substantive is conduct mitigation," the bank stated.
In summary, the ADHD/SUD group exhibited a substantial and complex symptomatology with severe substance abuse and lifetime psychosocial problems, including early and persistent antisocial behaviour, as well as psychiatric co-morbidity and poor general cognitive ability.
If it does, says program director Mark Frankel, "it will be a substantial and very complex undertaking".
The situation is complicated by the fact that the general question of when a convention, or rule of any kind, is in force for a speaker, is substantial and complex (cf. Pagin 1987: Chpt. 1).
They might have been nut cases who negotiated reality through bad puns and movie references, but they were substantial and complex nut cases.
Another big factor is the compact nature of the Japanese script means 140 characters allows for more substantial and complex posts.
The contamination effects were substantial and complex, and the magnitude varied depending on the wavelength, solar zenith and azimuth angles, weather conditions, and canopy phenological status.
Judith Brown at the National Autistic Society said the study added to scientists' appreciation of the substantial and complex role that genetics played in autism, but that more work was needed to truly understand autism's genetic make-up.
