Complex sentence: In 1842, about a quarter of the inner city was destroyed in the "Great Fire", which started on the night of 4 May and was extinguished on 8 May.
Split into simpler sentences: In 1842, about a quarter of the inner city was destroyed in the "Great Fire". This conflagration started on the night of the 4 May 1842 and was extinguished on 8 May.