Definition: Rewrite each original sentence in order to make it easier to understand by non-native speakers of English. You can do so by replacing complex words with simpler synonyms (i.e. paraphrasing), deleting unimportant information (i.e. compression), and/or splitting a long complex sentence into several simpler ones. The final simplified sentences need to be grammatical, fluent, and retain the main ideas of their original counterparts without altering their meanings.
Input: The northern part, the Restkreis Sankt Wendel, was merged into the district Birkenfeld, the southern part stayed in the Saarland in its reduced size.

The northern part, the Restkreis Sankt Wendel, was merged into the district Birkenfeld. The southern part stayed in the Saarland in its smaller size.