Complex sentence: Fire is more of a danger underground, such as the Kings Cross London fire in November 1987 which killed 31 people King's Cross fire and systems are built to allow evacuation of trains at many places throughout the system.
Split into simpler sentences: Fire is more of a danger underground, such as the King's Cross fire in London, November 1987 which killed 31 people. Systems are generally built to allow evacuation of trains at many places throughout the system.