Original: They found Plath dead of carbon monoxide poisoning in the kitchen, with her head in the oven, having sealed the rooms between herself and her sleeping children with wet towels and cloths. At approximately 4:30 am, Plath had placed her head in the oven, with the gas turned on.
Simplified: She sealed the room she was in with wet towels, turned the gas oven on and put her head inside the oven.