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 Civil Aviation Authority (CAA) is the public corporation which oversees and regulates all aspects of aviation in the United Kingdom.

The Civil Aviation Authority if the public company that watches and controls all parts of flying in the United Kingdom.