Complex sentence: Mangog has usually only been stopped by cutting it off from the psychic energies that sustain it, although Thor recently defeated Mangog by shoving Mjolnir into the beast's mouth and channelling a God Blast into it's very being.
Split into simpler sentences: Mangog has usually only been stopped by cutting it off from the psychic energies that sustain it. Thor once defeated Mangog by shoving Mjolnir into the beast's mouth and channelling a God Blast into its very being.