Complex sentence: That night, House observes an elderly hospital volunteer coughing and wiping her nose as she pushes around a cart of baby toys and blankets, and appears to realize that she was the original source of the virus.
Split into simpler sentences: That night, House observes an elderly hospital volunteer coughing and wiping her nose as she pushes around a cart of baby toys and blankets. He appears to realize that she was the original source of the virus.