Complex sentence: Instead, after learning the dragon's reason before fighting him personally, Donkaen is frozen when the X-Basher is impaled into his head and is sent drifting into space in a deep sleep.
Split into simpler sentences: Instead, after learning the dragon's reason before fighting him personally, Donkaen is sealed by freezing with the X-Basher impaled into his head. He is sent drifting into space in a deep sleep.