How do I make a boss loop with timing and different attacks?

I know how to do this from a very basic perspective but I can't figure out the simplest and most efficient way to do it. I feel like using a Timeline might be helpful but I have no idea how to use a timeline, and functions feel overcomplicated. Am I missing something obvious or am I going to have to figure out how to work with timelines?

A good tutorial with great example boss fight: construct.net/en/tutorials/epic-boss-battle-1140