What does this paragraph mean? Can someone please explain

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In many areas (e.g., Denmark and northern Germany) the various Nordish types are inextricably intermixed (as is also common among Northern Europeans in the United States), often with different subracial classifications between siblings or between parent and child, and with many individuals intermediate between types, but assigned to the type they favor most strongly. The relatively homogeneous population of Hallstatt Nordics in southeast Norway and central Sweden, which Carleton Coon called "a refuge area for the classic Nordic race," is an exception to this rule.
http://www.racialcompact.com/nordishrace.html

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