Complex sentence: Sir Ian Warwick Blair, QPM MA (born 19 March 1953) was a senior British Police Officer who held the position of Commissioner of Police of the Metropolis from 2005 to 2008 and was the highest ranking officer within the Metropolitan Police Service.
Split into simpler sentences: Sir Ian Warwick Blair, QPM MA (born 19 March 1953) was a senior British Police Officer who previously held the position of Commissioner of Police of the Metropolis from 2005 to 2008. Before his resignation he was the highest ranking officer within the Metropolitan Police Service.