Complex sentence: These cysts result from exaggerated physiological stimulation (hyperreactio luteinalis) and are usually associated with markedly elevated levels of beta-human chorionic gonadotropin (beta-hCG).
Split into simpler sentences: These cysts result from exaggerated physiological stimulation (hyperreactio lteinalis). Usually associated with markedly elevated levels of Beta-human chorionic gonadotropins (HCG).