Hair Child Simplification

Could someone explain me what this exactly does? And how to use it? I can’t find any information on this, not even in the manual!!

You mean Simplify option in Render tab? We need more details

No. I’m talking about when you toggle the “Strand Render” option on inside the Render tab inside the Particle Settings. A new option appears saying " Child Simplification" and playing around with it just seems to either get rid of my hair or destroy it.

I wanted to know what it does and what it is about.