Complex sentence: A common trait among Grim Reapers are their chartreuse phosphorescence eyes, and the fact that they were humans who committed suicide, sentenced to watch other people die endlessly until the sin of taking their own lives is forgiven by the heavens.
Split into simpler sentences: A common trait among Grim Reapers are their chartreuse phosphorescence eyes. All Grim Reapers were humans who committed suicide, and sentenced to watch other people die endlessly until the sin of taking their own lives is forgiven by the heavens.