Complex sentence: The organisation was founded in 1952 in Hanover under the leadership of Rudolf Christoph Freiherr von Gersdorff, one of the main reasons for its creation being the rise in injuries and deaths from road traffic accidents (hence the word "accident" in its name).
Split into simpler sentences: The organisation was founded in 1952 in Hanover under the leadership of Rudolf Christoph Freiherr von Gersdorff. One of the main reasons for its creation was the rise in injuries and deaths from road traffic accidents (hence the word "accident" in its name).