The phrase 'between simplicity and complexity' is correct and usable in written English.
It's typically used to refer to a situation or concept that lies somewhere in the middle of two extremes. For example, you could say "The goal of the project was to find a happy medium between simplicity and complexity".
There's an open problem in skill-based game design about the razor-thin line between simplicity and complexity.
Perhaps that was because the class reflected the discipline's own tension between simplicity and complexity, "good tough science," as Seligman calls it, and airier talk of values.
This tension, between simplicity and complexity, light and dark, fantasy and reality, is evident in Brinkley's later work, especially her more politically overt.
The comparison of the environmental assessment methods as presented here shows that the diversity of the methods has a good balance between simplicity and complexity, depending on the aim of the particular method itself.
In order to strike a balance between simplicity and complexity of our simulation model, we extracted the β-oxidation part of the mitochondrial model (reducing complexity), modified and completed it with respect to simulating mitochondrial fatty acid oxidation deficiencies.
In photographer mode, he sets off on backpacking adventures to document the beauty of nature, capturing the balance that it displays between light and shadow, simplicity and complexity.
But symbolically, it was momentous, a line in the sand drawn between the past and the future, collectivism and individualism, naturalism and abstraction, simplicity and complexity.
It is a work of great simplicity and complexity.
They show the variety's seemingly paradoxical combination of simplicity and complexity.
The physical scientist is, however, well aware of the existence of the problem (see below Simplicity and complexity).
Reading the passage as a writer, I am struck by its simplicity and complexity, by that "punctually" and "barn attached" and the quick, sentence-closing "fox" and "cove".
