Original sentence: They write formally in Standard German, but in many respects have hewn a separate national identity built upon their long history of stable, alpine, isolationist, multinationalist neutrality and their various Swiss German language dialects
Edited sentence: They write formally in Standard German, but in many respects have hewn a separate national identity built upon their long history of stable, alpine, isolationist, multinationalist neutrality and their various Swiss German language dialects, which are basically incomprehensible to someone who speaks only Standard German