Simplify the following text for a Grade 10 native English-speaking person.
Original: Walking Trees : Teaching Teachers in New York City Schools is the story of Ralph Fletcher 's introduction to the New York City school system as a teacher trainer in a writing staff development program .
Simplified: Walking Trees : Teaching Teachers in New York City Schools is the story of Ralph Fletcher 's work in the New York City school system as a teacher trainer program to teach teachers about writing .