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: Although they were officially designated to study just Jupiter and Saturn, the two probes were able to continue their mission into the outer solar system.

The two probes were supposed to study Jupiter and Saturn but continued into the outer solar system.