You can use the function object to help you with this. Create a function called "Explosion" which takes the number of explosions as a parameter.
On Function "Explosion"
For Loop, repeat Function.Param(0) times -> play explosion animation -> play explosion sound
if Function.Param(0) > 1 -> wait 1 second
When the player clicks:
on click -> Call Function "Explosion" with one parameter =1
This will play the explosion one time
At the end of layout -> Call Function "Explosion" with one parameter= 10
This will make 10 explosions (and so on).