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: From about 200 to 30 million years ago, the North American Plate was in continual collision with the Farallon Plate.

The North American plate kept hitting the Farallon Plate 20 to 30 million years ago.