The phrase "complex relation between" is grammatically correct and can be used in written English.
It is typically used to describe the intricate or complicated connection or interaction between two or more things. Example: The story explores the complex relation between love and loss, showing how they are often intertwined and inseparable.
These are critical to a better understanding of the relationship between health and functioning as shown in Figure 1 and illustrated by the conceptualisation of independence/dependence and positive health-related functioning and the complex relation between environmental and personal factors described in the social capital model of positive health functioning.
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.
These results are indicative of the complex relation between exercise and cognition.
Bot., A. The landmark approval of Provenge, what it means to immunology and 'in this issue': the complex relation between vaccines and autoimmunity.
The balance of paleo-SST evidence is inconclusive, but hints at a possible and spatially complex relation between dexcess and SST.
However, this approach provides vague information on the actual cortical areas involved, owing to the complex relation between the active brain areas and the sensor recordings.
To analyze the complex relation between various social indicators that contribute to socioeconomic status and health care barriers.
"The Plato Papers" could as reasonably (although with severely limited sales prospects) be presented as "Ackroyd's Poetics," a cogitation on the theory and practice of his writing -- more specifically on the complex relation between his novels and his biographies.
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.
The intricate yet complex relation between ritual and language can be seen in the history of various attempts to explain ritual behaviour.
The recent developments in plant genomics and the availability of microarray technology make it possible to better understand the complex relation between genes and fibre quality.
