In three or four sentences, describe why the vice president in a company makes a very high salary while a person who works in human resources at the same company makes much less?

A vice-president has a very level of responsibility as well as workload. Often, the people at higher levels have to take risky decisions, and that too in a shorter time. They supervise a large portion of a company.
A human resource person may have a high workload but they don't have to supervise such a significant portion of the company, and they are not responsible for improvising the company, year after year, but a VP is.