The Sentence Diagram Generator visually represents the sentence "He is working at the theater, and so is his wife." as follows:

1. Main Clause: "He is working at the theater"

   • Subject: "He"
   • Verb: "is working"
   • Prepositional Phrase: "at the theater"
     • Preposition: "at"
     • Object of the Preposition: "the theater"

2. Coordinating Conjunction: "and"

3. Second Clause: "so is his wife"

   • Subject: "his wife"
   • Verb: "is" (with "so" functioning as an adverb modifying the verb)

This structure illustrates the relationship between the two clauses and their components.