Complex sentence: However, after ovulation the granulosa cells produce progesterone that may maintain a potential pregnancy, and causes production of a thick cervical mucus which inhibits sperm entry into the uterus.
Split into simpler sentences: However, after ovulation the granulosa cells produce progesterone. The progesterone may maintain a potential pregnancy, and causes production of a thick cervical mucus that inhibits sperm entry into the uterus.