Complex sentence: Women regularly introduce substances into the vagina to reduce lubrication, including leaves, tree bark, toothpaste and Vicks menthol rub, a practice the WHO includes within Type IV FGM; the added friction during intercourse can cause lacerations and increased risk of infection.
Split into simpler sentences: Women regularly introduce substances into the vagina to reduce lubrication, including leaves, tree bark, toothpaste and Vicks menthol rub. The WHO includes this practice within Type IV FGM, because the added friction during intercourse can cause lacerations and increase the risk of infection.