The Sentence Diagram Generator allows you to input complex sentences like the one provided and visually represent their grammatical structure. To diagram the sentence "Now I would remind you, brothers, of the gospel I preached to you, which you received, in which you stand, and by which you are being saved, if you hold fast to the word I preached to you—unless you believed in vain," follow these steps:

1. Input the Sentence: Enter the entire sentence into the generator.
2. Identify Main Clauses: Break down the sentence into its main clauses and subordinate clauses.
3. Diagram Structure: Use the tool to create branches for subjects, verbs, objects, and modifiers, ensuring to represent the relationships between clauses accurately.
4. Customize: Adjust the diagram style as needed for clarity and visual appeal.

The generator will provide a visual representation that highlights the grammatical relationships and structure of the sentence, aiding in comprehension and analysis.