Well, let's say, you want to use slow motion, for the first action (at the top) you put slowmo with a % to your liking, then delay (second line) with the time you want for the slow motion to be active and then slow motion again (line 3) at 100% to go back for normal speed.
I suggest you to watch Fallen;ninja tutorials in the case you're missing something.
Keep in mind that multiple scripts can't run at the same time, scripts will either get queued (by default) or set to not execute at all.
Suppose you use a delay of 30 seconds, then spawn a vehicle. Then any additional script triggers won't fire until after that 30 seconds has passed and the script finishes, making room to run the next queued script.