What is the relationship between electric and magnetic fields?

A magnetic field is not just an electric field with relativity applied , i.e. an electric field viewed from the wrong reference frame. In reality, a magnetic field is a fundamental field which can exist in a certain reference frame without needing any help from an electric field.

Both electric and magnetic fields are the consequence of the attraction and repulsion of electric charges . However, a magnetic effect is caused by moving electric charges while an electric field is caused by stationary charges.17 Haz 2020

A magnetic field is a field explaining the magnetic influence on an object in space. A electric field is a field defined by the magnitude of the electric force at any given point in space.