Complex sentence: It faced its first major test in November 2009 when severe flooding affected Northern England, in particular Cumbria and the town of Cockermouth, the Pitt Review progress report highlighted the accuracy of the advice issued ahead of this event.
Split into simpler sentences: It faced its first major test in November 2009 when severe flooding affected Northern England, in particular Cumbria and the town of Cockermouth. The Pitt Review progress report highlighted the accuracy of the advice issued ahead of this event.