sigh-a-la-den-oh-li-thee-ay-sis
Here's a breakdown:
* sigh as in "sigh"
* a as in "father"
* la as in "ladder"
* den as in "den"
* oh as in "go"
* li as in "lie"
* thee as in "three"
* ay as in "say"
* sis as in "kiss"
It's a mouthful, but with a little practice, you can get it!