Complex sentence: The measles virus is the cause of measles, an infection of the respiratory system Meat ymptoms include fever, cough, runny nose, red eyes and a generalized, maculopapular, erythematous rash.
Split into simpler sentences: The measles virus is the cause of measles, an infection of the respiratory system. Symptoms include fever, cough, runny nose, red eyes and a generalized, maculopapular, erythematous rash.