Complex sentence: It is important that the pressure immobilisation bandage not be removed prematurely; it should remain in place until intravenous access has been established, adequate medical monitoring is in place and a supply of antivenom is available.
Split into simpler sentences: It is important that the pressure immobilisation bandage not be removed prematurely. It should remain in place until intravenous access has been established, adequate medical monitoring is in place and a supply of antivenom is available.