Complex sentence: The historical local nickname of Kallstadt inhabitants is "Brulljesmacher" (Palatine German for "loudmouth" respectively via French "brouilles", "troublemaker"), humorously referring to the inhabitants as big mouthed braggarts.
Split into simpler sentences: The historical local nickname of Kallstadt and its inhabitants is "Brulljesmacher" (Palatine German for "loudmouth" respectively via French "brouilles", "troublemaker"). The id is humorously referring to the inhabitants as big mouthed braggarts.