ˈhɛrt͡soːɡənˌʔaʊ̯ʁax
Here's a breakdown:
* Herzo-: Sounds like "hair-tso"
* gen-: Sounds like "gen"
* aurach: Sounds like "ow-rakh"
The "ch" at the end is pronounced similar to the "ch" in "Bach" or "loch."
It's tricky to pronounce for non-native speakers, so don't worry if you find it difficult at first. Just practice and you'll get it eventually!