Complex sentence: He told her to boil an egg but she must not eat it, instead she was to use the condensation from cooking the egg to rub on her eyes with unwashed hands; this would give her the power to see and know everything she wanted.
Split into simpler sentences: He told her to boil an egg but she must not eat it. Iinstead she was to use the condensation from cooking the egg to rub on her eyes with unwashed hands, which would give her the power to see and know everything she wanted.