The Sentence Diagram Generator visually represents the grammatical structure of the sentence: "The twisty ribbon of a road followed the rushing river."

1. Subject: The twisty ribbon of a road

   • Modifier: twisty (modifies ribbon)
   • Prepositional Phrase: of a road
     • Object of the Preposition: road
       • Modifier: a (modifies road)

2. Predicate: followed the rushing river

   • Direct Object: the rushing river
     • Modifier: rushing (modifies river)
     • Article: the (modifies river)

This structure can be visually represented in a diagram format, illustrating the relationships between the subject, predicate, and their respective modifiers and phrases.