Instructions: 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: A new frontal ridge had formed on August 17 which caused the storm to drift in a westerly direction.
Output:
The storm drifted west because of a frontal ridge on August 27th.