Complex sentence: The new approach to representation can be observed in several aspects, primarily in its realism and acute observation of the small details of the man's appearance; the beginning of a new realism painters were able to achieve using oil as a medium.
Split into simpler sentences: The new approach to representation can be observed in several aspects, primarily in its realism and acute observation of the small details of the man's appearance. In this it marks the beginning of a new realism painters were able to achieve using oil as a medium.