Complex sentence: A large amount of force is required to cause pulmonary contusion; a person injured with such force is likely to have other types of injuries as well, and pulmonary contusion can be used to gauge the severity of trauma.
Split into simpler sentences: A large amount of force is required to cause pulmonary contusion; a person injured with such force is likely to have other types of injuries as well. In fact, pulmonary contusion can be used to gauge the severity of trauma.