Complex sentence: Oral infections and inflammations may affect overall health and conditions in the oral cavity may be indicative of systemic diseases, such as osteoporosis, diabetes, celiac disease or cancer.
Split into simpler sentences: Oral infections and inflammations may affect overall health and certain systemic diseases can affect the oral cavity. Conditions in the oral cavity may be indicative of systemic diseases such as osteoporosis, diabetes, celiac disease or cancer.