Simplify the following text for a Grade 7 native English-speaking person.
Original: Frederick Herman Jones , Jr. , better known Fred or Freddie , is a fictional character in the American television animated series Scooby-Doo , about a quartet of teenage mystery solvers and their Great Dane companion , Scooby-Doo .
Simplified: Fred Jones also known as Fred , or Freddie is a fictional character from Scooby-Doo .