Complex sentence: A 20-year history of hemoptysis is rarely observed in tuberculosis, but not impossible; similarly, cavernous tuberculosis is rare in childhood, but cannot be excluded in the case of Emilia Chopin.
Split into simpler sentences: A 20-year history of hemoptysis is rare in tuberculosis, but not impossible. Similarly, cavernous tuberculosis is rare in childhood, but cannot be excluded in the case of Emilia Chopin.