Complex sentence: In the end, Arukenimon was killed by MaloMyotismon, who grabbed her by the neck, repeatedly stabbed her with his sharp tail like a scorpion and finally let one of the heads on his shoulders devour her head, causing the rest of her body to disintegrate.
Split into simpler sentences: In the end, Arukenimon was killed by MaloMyotismon, who grabbed her by the neck, and repeatedly stabbed her with his sharp tail like a scorpion. Finally, he then let one of the heads on his shoulders devour her head, causing the rest of her body to disintegrate.