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: Initially about 30,000 people moved to the goldfields, but by 1863 this had declined to about 3,500 because of the difficult mining conditions.

At the beginning 30,000 people moved to the goldfields. By 1863 only 3,500 moved there because of the difficult mining conditions.