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: According to the fictional universe first established by Slayer, the 'Buffyverse,' The term 'Buffyverse' is used amongst fans of Buffy / Angel online to describe the fictional universe established by Buffy / Angel.

"Buffyverse" is the fake universe first created by Slayer, and is a word used among fans of Buffy/Angel.