The Sentence Diagram Generator visually represents the grammatical structure of the sentence: "At the time, I had thought Sarah Wildes was the only executed innocent in that group."

1. Main Clause: "I had thought"

   • Subject: "I"
   • Verb: "had thought"
   • Direct Object: "Sarah Wildes was the only executed innocent in that group"

2. Embedded Clause: "Sarah Wildes was the only executed innocent in that group"

   • Subject: "Sarah Wildes"
   • Verb: "was"
   • Predicate Noun: "the only executed innocent"
     • Modifier: "only"
     • Adjective: "executed"
   • Prepositional Phrase: "in that group"
     • Preposition: "in"
     • Object of the Preposition: "that group"
       • Demonstrative Adjective: "that"
       • Noun: "group"

3. Prepositional Phrase: "At the time"

   • Preposition: "At"
   • Object of the Preposition: "the time"
     • Article: "the"
     • Noun: "time"

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