Here's how to pronounce it:
* Добро (Dobro) - "DO-bro"
* пожаловать (pozhalovat') - "po-zha-LO-vat'"
* домой (domoy) - "do-MOY"
So, the full pronunciation is: DO-bro po-zha-LO-vat' do-MOY.
You can also use the more informal "С возвращением домой" (S vozvrashcheniem domoy) which means "Welcome back home".
The pronunciation of this is:
* С (S) - "S"
* возвращением (vozvrashcheniem) - "voz-vra-SHCHE-ni-em"
* домой (domoy) - "do-MOY"
So, the full pronunciation is: S voz-vra-SHCHE-ni-em do-MOY.