Before  Medical conditions could include Polycystic Ovarian Syndrome (PCOS), sexually transmitted infections (STIs), endometrial tuberculosis in women, and in men could be due to hormonal imbalances, varicocele, undescended testicles, or even certain previous surgeries.    After                 In women, medical conditions could include Polycystic Ovarian Syndrome (PCOS), sexually transmitted infections (STIs) and endometrial tuberculosis. In men, infertility could be due to hormonal imbalances, varicocele, undescended testicles, or even certain previous surgeries.   Comments  Split it into two shorter sentences for brevity and clarity  Started with 'In women' to make it parallel to the second sentence that starts with 'In men'.