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: It is the established convention of the scientific community to define the vitreous electrification as positive, and the resinous electrification as negative.

It is normal for scientists to call the vitreous electrification positive, and the resinous electrification negative.