Task: Text Simplification
Input (English): 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.
Output (English): in the fictional universe first established by slayer , called the ' buffyverse ' , the term ' buffyverse ' is used by the fans of buffy / angel on the internet to describe the fictional universe established by buffy / angel.