"Changing relations" refers to the fluctuating or evolving connections, interactions, or dynamics between individuals or groups. It suggests that the nature, closeness, or circumstances of relationships may transform over time. Full definition
His conversion does not change the relation between the powers. (religion-online.org)
The tremendous advances in pure science made during the 20th century have completely changed the relation between science and society. (science.sciencemag.org)
By changing the relation ship of how long the pulse is on versus how long the pulse is off the duty cycle is changed. (mechanics.stackexchange.com)