Complex sentence: Working in a hazmat suit is very strenuous, as the suits tend to be less flexible than conventional work garments, and-with the exception of laboratory versions-are hot and poorly ventilated (if at all).
Split into simpler sentences: Working in a Hazmat suit is very strenuous, as the suits tend to be less flexible than conventional work garments. With the exception of laboratory versions, Hazmat suits can be hot and poorly ventilated (if at all).