This is the 9568th most frequent Polish word.
wschodnioniemiecka
"East German" (feminine singular adjective in Polish).
Here, 'wschodnioniemiecka' functions as an adjective describing the noun 'polityka' (politics), indicating that the politics in question are specific to East Germany.
Wschodnioniemiecka polityka była skupiona na socjalizmie.
East German politics were focused on socialism.
In this sentence, 'wschodnioniemieckich' describes 'dzieciach' (children) as an adjective in the plural masculine personal form, denoting their geographical connection to East Germany.
Ta książka opowiada o wschodnioniemieckich dzieciach żyjących pod reżimem.
This book tells about East German children living under the regime.
Here, 'wschodnioniemieckie' is used as an adjective modifying 'zabytki' (monuments), showing that these monuments are historically and culturally related to East Germany.