Complex sentence: The notion of structure "as embedded institutions or norms that shape the actions of social agent" s is important, as structural determination may occur as the actions of people and organizations are guided partially by the underlying structures in the social system.
Split into simpler sentences: The notion of structure "as embedded institutions or norms that shape the actions of social agent" s is important, because it explains how "structural determination" may occur. Structural determination occurs when the actions of people and organizations are guided (if only partially) by the underlying structures in the social system.