Complex sentence: Disposable hygiene products are a monthly expense that many women and girls simply cannot afford, and a lack of available products means inadequate, unhygienic alternatives are used, which can present a serious health risk.
Split into simpler sentences: Disposable hygiene products are a monthly expense that many females simply cannot afford. A lack of affordable hygiene products means inadequate, unhygienic alternatives are used, which can present a serious health risk.