Simultaneous task -Design Advice

I have to design the workflow where a user sets up multiple tasks that will run automatically.

Those tasks have two possibilities:

1. They do something simultaneously - Task 1 and Task 2 run at the same time.
2. First Task 1 runs and then Task 2 runs.

Any ideas on how I can improve the actual design so users know that they can set tasks to run at the same time, but also know there is a then option?

Thanks in advance.