The Sentence Diagram Generator is designed to visually represent the grammatical structure of complex sentences like the one provided. To diagram the sentence "We had an internal deep dive yesterday to identify better more granular milestones for the project so we can provide more valuable communication during our functional updates," you would follow these steps:

1. Identify the Main Clause: "We had an internal deep dive yesterday."
2. Identify the Infinitive Phrase: "to identify better more granular milestones for the project."
3. Identify the Purpose Clause: "so we can provide more valuable communication during our functional updates."

The diagram would visually separate these components, showing the relationships between the subject, verb, and objects, as well as the modifiers and phrases that provide additional context. Each part of the sentence would be connected appropriately to illustrate the grammatical structure clearly.

For a detailed visual representation, please use the Sentence Diagram Generator tool to input the sentence and generate the corresponding diagram.