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: Command Module Pilot Stuart Roosa took several hundred seeds on the mission, many of which were germinated on return resulting in the so called Moon trees.

Command Module Pilot Stuart Roosa took several hundred seeds on the mission. They were sprouted on return. They're called Moon trees.