Complex sentence: In demonology, Beleth also spelled Bilet, Bileth, Byleth and Bilith is a mighty and terrible king of Hell, who has eighty-five legions of demons under his command.
Split into simpler sentences: In demonology, Beleth also spelled Bilet, Bileth, Byleth and Bilith. It's a mighty and terrible king of Hell, who has eighty-five legions of demons under his command.