The Sentence Diagram Generator visually represents 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
   • Object: the idea
   • Prepositional Phrase: for the book

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

   • Subject: who
   • Verb: wrote
   • Object: the book 'Stuart Little'

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

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

This structure can be visually represented using the Sentence Diagram Generator, allowing for a clear understanding of the relationships between the components of the sentence.