Complex sentence: Five minutes later a train fault with risk of derailment was indicated to the driver and the train was brought to a controlled stop adjacent to door leading to the service tunnel, at 21:58 and about from the French portal.
Split into simpler sentences: Five minutes later, a train fault with risk of derailment was indicated to the driver. The train was brought to a controlled stop adjacent to a door leading to the service tunnel, at 21:58 and about from the French portal.