Split and simplify the following sentence while retaining its full meaning: Whereas in order to ensure that imported animals are actually intended for breeding they must be accompanied by the pedigree and breeding certificates and the health certificates normally required for such animals and importers must undertake to keep the animals alive for a certain period.
 Simplified version:
To ensure that the imported animals are actually used for breeding , they must be accompanied by proof of parentage , breeding certificate and animal health certificate , as required for breeding cattle . In addition , the importer must undertake to keep the animals in question for a minimum period of time .