Complex sentence: When it is first visited by Angel, the room is occupied by a small girl Forgiving named Mesektet, the most malevolent member of the Ra-Tet, a family of mystic beings.
Split into simpler sentences: When it is first seen, the room is occupied only by a small girl. Forgiving She is Mesektet, the most malevolent member of the Ra-Tet, a family of mystic beings.