Complex sentence: Hospital-acquired infection (HAI)--also known as nosocomial infection--is an infection that is spread by microorganisms present in the hospital environment, on staff, visitors, nursing home environment, rehabilitation facility, or other clinical settings.
Split into simpler sentences: Hospital-acquired infection (HAI)--also known as nosocomial infection--is an infection that is contracted from the environment or staff of a healthcate facility. It can be spread in the hospital environment, nursing home environment, rehabilitation facility, or other clinical settings.