Complex sentence: Congress enacted the to provide a legal framework to deal with military contractors engaged in defrauding the federal government, either through overcharging for products or providing defective war materiel, including food and weapons.
Split into simpler sentences: Congress enacted the to provide a legal framework to deal with military contractors engaged in defrauding the federal government. This fraud occurred through either the overcharging of products or providing defective war material, including food and weapons.