Complex sentence: Many women experience secondary fertility signs that correlate with certain phases of the menstrual cycle, such as abdominal pain and heaviness, back pain, breast tenderness, and mittelschmerz (ovulation pains).
Split into simpler sentences: Many women experience secondary fertility signs that correlate with certain phases of the menstrual cycle. Examples include abdominal pain and heaviness, back pain, breast tenderness and mittelschmerz (ovulation pains).