Generate Activity Diagram (Join & Fork) from Use Case flow of events

From examples given, the auto-generated activity diagram normally restricted in using <decision - Merge> node only.
I have an activity diagram having the scenario on using and node, but I am not sure how should I write the use case flow of events, so it will help to auto-generate such activity diagram with Fork and Join.

Any idea/sample of use case flow is greatly appreciated.
Thank you.