Simplify the following text for a Grade 9 native English-speaking person.
Original: Newgrounds is the oldest Flash portal website , and is distinguished by its automated submission and rating system , as it is the first website in history to produce a fully automated user-generated content system .
Simplified: Newgrounds is different from most other Flash websites by its automated submission and rating system . It was the first website in history to produce a fully automated user-made content system .