Tree diagrams are the notation that most syntacticians use to describe how sentences are organized in the mental grammar.
The tree diagram is a newer method for diagramming sentences that is most commonly used by linguists and other academic professionals. While the Reed-Kellogg diagram was considered an effective tool for students to visualize sentence structure, it had many limitations. It dispensed with traditional word order and used a variety of occasionally confusing symbols, meaning the resulting diagram was difficult to understand for anyone unfamiliar with the method. Basically, we use tree diagram to break down a sentence.