Org A split off of Org B, Org B split into Org C & Org D, Org A and Org D merged into Org E?
can be turned into Mermaid notation
graph TD;
B --> A;
B --> C;
B --> D;
A --> E;
D --> E;
which Github renders as:
graph TD;
B --> A;
B --> C;
B --> D;
A --> E;
D --> E;