The Sentence Diagram Generator will visually represent the grammatical structure of the sentence: "It all started when Timmy travelled to town by mistake in a wicker basket."

1. Main Clause: "It all started"

   • Subject: "It"
   • Predicate: "started"
   • Complement: "all"

2. Subordinate Clause: "when Timmy travelled to town by mistake in a wicker basket"

   • Subject: "Timmy"
   • Predicate: "travelled"
   • Prepositional Phrase: "to town"
     • Object of the Preposition: "town"
   • Adverbial Phrase: "by mistake"
   • Prepositional Phrase: "in a wicker basket"
     • Object of the Preposition: "basket"
     • Adjective: "wicker"

This structure can be visually diagrammed to illustrate the relationships between the components of the sentence.