Original sentence: Although the RAF had continued to use aerial photography since the end of World War I, by 1939 it had become a very under-developed and neglected branch of the service.Birtles  gives the following reasons for the suitability of the Mosquito for PR operations: could carry more cameras than the Spitfire; long range combined with high speed; security of two engines; navigator could locate and identify targets whilst pilot concentrated on flying (and evasion when necessary).On 4 December, Sqn Ldr Alastair Taylor DFC with two bars and his navigator, Sgt.On the eve of World War II, Sidney Cotton took aerial photos during flights over parts of the Middle East, North Africa and even over German military airfields.Sidney Horsfall, were lost in the Trondheim-Bergen area, becoming the first 1 PRU casualties
Edited sentence: Although the RAF had continued to use aerial photography since the end of WWI, by 1939 it had become a very under-developed and neglected branch of the service.Birtles  gives the following reasons for the suitability of the Mosquito for PR operations:- could carry more cameras than the Spitfire; long range combined with high speed; security of two engines; navigator could locate and identify targets whilst pilot concentrated on flying (and evasion when necessary).On the eve of WWII, Sidney Cotton took aerial photos during flights over parts of the Middle East, North Africa and even over German military airfields.Sidney Horsfall, were lost in the Trondheim - Bergen area, becoming the first 1 PRU casualties.Unfortunately, on 4 December, Sqn Ldr Alastair Taylor DFC with two bars and his navigator, Sgt