Complex sentence: Styes normally heal on their own by rupturing within a few days to a week, causing the relief of symptoms, but if it does not improve or it worsens within two weeks, a doctor's opinion should be sought.
Split into simpler sentences: Styes normally heal on their own by rupturing within a few days to a week, causing the relief of symptoms. A stye usually will heal within a few days to a week, but if it does not improve or it worsens within two weeks, a doctor's opinion should be sought.