Original sentence: 46_Sum, however - due to delay in it's serial production and changes made to even improve that modern plane none of them were delivered before 1 September 1939.50 Jastrząb, but its pilots were among the world's best trained, as proven a year later in the Battle of Britain, in which the Poles played a major part.Polish Air Force ordered also 300 very modern polish medium bombers - PZL.The Polish Air Force (Lotnictwo Wojskowe) was at a severe disadvantage against the German Luftwaffe due to inferiority in numbers and obsolescence of its fighter planes.The Polish Air Force lacked modern fighters, vastly due to delay in introduction of modern polish multi-purpose fighter PZL.The Polish Army had approximately a million soldiers, but less than half were mobilized by 1 September
Edited sentence: 38 Wilk and delay in introduction of completly new modern polish multi-purpose fighter PZL.46_Sum, however - due to delay in it's serial production and changes made to even improve that modern and technically advanced plane none of them were delivered before 1 September 1939.50 Jastrząb.However its pilots were among the world's best trained, as proven a year later in the Battle of Britain, in which the Poles played a major part.Polish Air Force in late 1938 ordered from PZL also 300 very modern polish medium bombers - PZL.The Polish Air Force (Lotnictwo Wojskowe)being one of the most modern and numerous in Europe in the 1920-ies was in the eve of the Second World War at a severe disadvantage against the German Luftwaffe due to inferiority in numbers and obsolescence of its fighter planes.The Polish Air Force lacked modern fighters, vastly due to withdrawal of many advanced projects, such as for example PZL.The Polish Army had approximately a million soldiers,but not all were mobilized by 1 September.The progress in military aviation in the 1930s was enormous, and it's result was that airplanes built a few years earlier on the eve of the war turned out to be outdated