Complex sentence: He reaffirmed the principle that there exists a "general area" or "domain" of criminal, instead the two government can make law on the same matter by creating a distinction between the types of culpability.
Split into simpler sentences: He reaffirmed the principle that there exists a "general area" or "domain" of criminal. Thus the two governments can make law on the same matter by creating a distinction between the types of culpability.