Complex sentence: In medicine, "red eye" is a non-specific, almost colloquial, term to describe an eye that appears red due to illness or injury, conjunctivitis and subconjunctival hemorrhage being two of the less serious but more common causes.
Split into simpler sentences: In medicine, "red eye" is a non-specific, almost colloquial, term to describe an eye that appears red due to illness or injury. Conjunctivitis and subconjunctival hemorrhage are two of the less serious but more common causes.