The phrase "an additional level of complexity to" is correct and usable in written English.
It can be used when discussing something that adds more intricacy or difficulty to a situation, concept, or process.
Example: "The new regulations introduced an additional level of complexity to the compliance process, making it harder for businesses to adapt."
Alternatives: "a further layer of complexity to" or "an extra dimension of complexity to".
I should note that there's an additional level of complexity to the story.
We have recently discovered an allosteric switch in Ras, bringing an additional level of complexity to this GTPase whose mutants are involved in nearly 30% of cancers.
The complexity of the cancer biology being the result of so many different interactive mechanisms whether driving or not the process of cancer cells is an additional level of complexity to approach more inclusive clinical trial access.
Recent advances have demonstrated that placing genes in a specific nuclear context plays an important role in the regulation of coordinated gene expression, thus adding an additional level of complexity to the mechanisms of gene regulation.
This is by no means an exhaustive list of everything you could (or should) be doing to keep up with your finances today and ensure a financially secure tomorrow -- but it is a reasonable start to understanding your financial picture without adding an additional level of complexity to your already hectic life.
Therefore, intratumor heterogeneity adds an additional level of complexity to the study of cancer development and poses challenges for the development of successful therapies.
Biological systems have an additional level of complexity compared to other chemical systems because of the effects of metabolic regulation, a defining feature of biosystems.
Such changes are observed in the transition of the neonatal to the adult myocardium, indicating an additional level of complexity for autophagy to contribute metabolically.
However, a strong influence of MOI on the level and dynamics of transient cell responses (Table 1) brings up an additional level of complexity, which needs to be addressed in future studies.
We thereby bring an additional level of complexity in the highly complex role played by PGE2 in colon cancer progression.
Finally, Chen et al. (11) provided an additional level of complexity in acetylation balance, as SIRT1 was shown to directly affect the activity of numerous AT protein complexes.
