Complex sentence: The clostridium perfringens enterotoxin (CPE) mediating the disease is heat-labile (inactivated at) and can be detected in contaminated food, if not heated properly, and feces.
Split into simpler sentences: The clostridium perfringens enterotoxin (CPE) mediating the disease is heat-labile (inactivated at). It can be detected in contaminated food (if not heated properly), and feces.