Complex sentence: Relics of these languages include toponyms across Central and Western Europe and some vocabulary in Germanic and Balto-Slavic languages that cannot be traced to a common Indo-European ancestor.
Split into simpler sentences: Relics of these languages include toponyms across Central and Western Europe. And there is trace evidence of indigenous non-Indo-European vocabulary seen in Germanic and Balto-Slavic languages; that cannot be traced to a common Indo-European ancestor.