Complex sentence: Padlocks often had to be destroyed when staff forgot to remove them at the end of the working period, in which case they would have to be cut off and it is a slow procedural system with poor traceability in the event of an incident.
Split into simpler sentences: Padlocks often had to be destroyed when staff forgot to remove them at the end of the working period, in which case they would have to be cut off. It is also a slow procedural system with poor traceability in the event of an incident.