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: As demand for coal slipped following World War II, mines began to close across the region, causing mass unemployment.

Demand for coal went down after World War II. Mines began to close across the area, causing mass unemployment.