The Sentence Diagram Generator visually represents the grammatical structure of the sentence: "The stone which the builders rejected is become the head of the corner."

1. Subject: The stone

   • Modifier: which the builders rejected
     • Subject: the builders
     • Verb: rejected

2. Predicate: is become the head of the corner

   • Subject Complement: the head
   • Modifier: of the corner
     • Preposition: of
     • Object: the corner

This structure illustrates the relationships between the components of the sentence, highlighting the main subject, modifiers, and predicate.