The phrase "a complex relation" is correct and commonly used in written English.
It refers to a complicated or intricate connection or association between two or more things. Example: Understanding the complex relation between economic growth and environmental sustainability is crucial for creating effective policies.
This ambiguity stems in part from a complex relation that has been observed to exist among ECM-related cues, actin cytoskeletal organization, and MMP-2 activation.
The variety of evidence related to the source of the post-stimulus undershoot indicates a complex relation between each of the three sources and their respective cortical localities.
And obviously, both Islam and Mormonism have a complex relation to the practice of plural marriage.
This colonial entanglement makes for a complex relation between colony and metropole - a psychic entanglement that is often beyond the understanding of a third-generation British citizen of West Indian ancestry.
Other commentators on globalisation have argued that the nation-state is in decline; Meiksins Wood argues that on the contrary "the world today is more than ever a world of nation-states": "The very essence of globalisation is a global economy administered by a global system of multiple states and local sovereignties, structured in a complex relation of domination and subordination".
Results show that a complex relation exists between PCM and TCE volume percentages.
However, an increasing number of publications indicate a more complex relation between the primary tumour and DTCs, with considerable discrepancies noted at the genomic level [ 12, 13].
There was also an absence of a direct relation between weight loss and change in intracranial pressure, potentially suggesting a more complex relation, which could be influenced by a weight threshold for raised intracranial pressure in individual patients.
It requires deciding whether there are complex facts, such as general facts or negative facts, or whether there is a more complex relation of correspondence between complex propositions and simple facts.
This 'connectivity' increased with NAPL saturation, but was shown to have a more complex relation to the water saturation and pore size distribution of the soil.
