Original sentence: The Border checkpoint Helmstedt–Marienborn (), called Grenzübergangsstelle Marienborn (GÜSt) (border crossing Marienborn) by the German Democratic Republic (GDR), was the largest and most important border crossing on the inner German border during the division of Germany
Edited sentence: The Border checkpoint Helmstedt–Marienborn (), called Grenzübergangsstelle Marienborn (GÜSt) (border crossing Marienborn) by the German Democratic Republic (GDR), was the largest and most important border crossing on the inter-German border during the division of Germany