Complex sentence: If delays are for reasons beyond the contractor's control, the contractor can request an Extension of Time: if the Contract Administrator allows this, it in effect extends the period before which the contractor is liable to pay the LAD.
Split into simpler sentences: If delays are for reasons beyond the contractor's control, the contractor can request an Extension of Time. If the Contract Administrator allows this, it in effect extends the period before which the contractor is liable to pay the LAD.