How do I pronounce Tsisiststas?

The word "Tsisiststas" is not a recognized word in any major language. It's likely a made-up word, possibly a name or a term from a fictional world.

Without knowing the context or origin of this word, it's impossible to say how to pronounce it.

If you can provide more information about where you encountered this word, I might be able to help you figure out the pronunciation.