who examined how social institutions have changed and evolved over time and labeled the changes sociocultural evolution

The answer is: Gerhard Lenski

According to gerhard Lenski, sociocultural evolution describes the gradual changing process that occurs within society over time.

The changes could include various factors, such as the basic principles of right or wrong, the government institutional role in maintaining the peace/order of different groups in society, the assimilation process between different culture in same area, etc.