The Sentence Diagram Generator will visually represent the grammatical structure of the sentence: "E.B. White, who wrote the book Stuart Little, got the idea for the book while he was sleeping on a train."

1. Main Clause: "E.B. White got the idea for the book."

   • Subject: E.B. White
   • Verb: got
   • Direct Object: the idea
   • Prepositional Phrase: for the book

2. Relative Clause: "who wrote the book Stuart Little"

   • Subject: who
   • Verb: wrote
   • Direct Object: the book
   • Appositive: Stuart Little

3. Adverbial Clause: "while he was sleeping on a train"

   • Conjunction: while
   • Subject: he
   • Verb: was sleeping
   • Prepositional Phrase: on a train

The diagram will visually connect these components, illustrating their relationships and dependencies within the sentence structure.