Complex sentence: For example, an infectious disease or biological weapon that transmits through the air could not infect a person in a closed life support system, as an internal supply of air and a physical barrier would exist between the person and the affected environment.
Split into simpler sentences: For example, an infectious disease or biological weapon that transmits through the air could not infect a person in a closed life support system. An internal supply of air and a physical barrier would exist between the person and the affected environment.