Complex sentence: A work of fiction is an act of creative invention; its total faithfulness to reality is not typically assumed by its audience, and so it is not expected to present only characters who are actual people or descriptions that are factually accurate.
Split into simpler sentences: A work of fiction is an act of creative imagination, so its total faithfulness to reality is not typically assumed by its audience. Therefore, fiction is not expected to present only characters who are actual people or descriptions that are factually accurate.