( 4 ) Whereas , for the control of residues , as provided for in appropriate Community legislation , maximum residue limits should usually be established for the target tissues of liver or kidney; whereas , however , the liver and kidney are frequently removed from carcasses moving in international trade , and maximum residue limits should therefore also always be established for muscle or fat tissues.
The above sentence is very complicated. Please provide me a simplified synonymous version consisting of multiple sentences:
( 4 ) The control of residues as required by the relevant Community legislation will usually require the setting of maximum residue limits in the tissues , liver or kidneys to be examined . However , liver and kidneys are often removed from carcases destined for international trade and therefore maximum residue limits in muscle or adipose tissue should always be set .