Simplify the following text for a Grade 6 native English-speaking person.
Original: Although it was an autograph book , bound with red-and-white checkered cloth and with a small lock on the front , Frank decided she would use it as a diary , and began writing in it almost immediately .
Simplified: It was actually an autograph book with red-and-green cloth and a small lock on the front , but Frank decided to use it as a diary . She began writing in it almost immediately .