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: Since Poland's accession to the European Union, a significant number of Poles have emigrated to Western European countries such as the United Kingdom, Germany and Ireland in search of work.

Since Poland's rise to the European Union, many Poles have emigrated to Western Europe countries such as United Kingdom, Germany and Ireland in search of work.