Complex sentence: The California "is not sold in (California) USA/NA although demand is high, the name" California' was previously used by Volkswagen for the Westfalia-built campervans since 1988.
Split into simpler sentences: The "California" is not sold in (California) USA/NA although demand is high. The name "California" was previously used by Volkswagen for the Westfalia-built campervans since 1988.