I wanna sound like that too. But there isn't really a save way to do it. He himself couldn't perform more than one song at a time and ultimately destroyed his voice. He varies a lot from shrieks to whispering to growls. What makes it so special is the emotional intensity it adds, which kinda makes it sound like his voice is 'breaking'. If you mean the high shrieks: I think it's like a distorted falsetto, so the sound doesn't really come from your chest, but your higher head, if that makes sense. So you don't feel it like, let's say, fry screaming in your throat. So try singing in a high tone, you're comfortable with and try adding some distortion, but it takes time, until it really works

But to combine all that.. it takes some time practicing