Simplify the following text for a Grade 5 native English-speaking person.
Original: Potter was one of the first to be responsible for such merchandise when she patented a Peter Rabbit doll in 1903 and followed it almost immediately with a Peter Rabbit board game .
Simplified: Potter was one of the first to begin such merchandise when she made a Peter Rabbit doll in 1903 . After that , a Peter Rabbit board game was produced .