Complex sentence: In 1906, a motoring accident on the North Road, near Hatfield in Hertfordshire, where his chauffeur missed the road in the darkness whist travelling at high speed, meant he was paralysed from the waist down for the rest of his life.
Split into simpler sentences: In 1906, he was injured in a motor accident on the Great North Road, near Hatfield in Hertfordshire, when his chauffeur missed the road in the darkness whist travelling at high speed. He was paralysed from the waist down for the rest of his life.