Complex sentence: He appeared to use a scientific concept to create a new natural-supernatural relationship using a fourth dimension, which, in modern physics, cannot be visualized, and relates to mathematical and physical measurements and is always expressed as a mathematical equation.
Split into simpler sentences: He appeared to use a scientific concept to create a new natural-supernatural relationship using a fourth dimension, which, cannot be visualized due to the limitations of current practices within physics. His concept relates to mathematical and physical measurements and is always expressed as a mathematical equation.