Split and simplify the following sentence while retaining its full meaning: Whereas Article 3 of Council Regulation ( EEC ) No 2763/75 ( 5 ) provides for the possibility of curtailing or extending the storage period; whereas , therefore , provision should be made to fix not only the amounts of aid for a specific period of storage but also the amounts to be added or deducted if this period is curtailed or extended.
 Simplified version:
According to Article 3 of Council Regulation ( EEC ) No 2763/75 ( 5 ) , the storage period can be shortened or lengthened . Thus , in addition to the aid amounts for a certain storage period , the surcharges and deductions should be fixed if this period is extended or reduced .