Its either
Blume has had an extremely and uncommonly long writing career.
Or
Blume is a gifted writer who can write for children as well as adults.
After sentence 4. Because you already stated Pan was influential then you can state how he was influential.
A third-person limited point of view is when the narrator knows as much as the reader does. A third-person omniscient point of view is when the narrator knows the feelings/emotions of the character.
Inferring is when a person concludes information by reasoning instead of actual said facts. When a person predicts something, he/she is trying to foretell what is going to happen in the future.