Complex sentence: During a visit to the European Organisation for Nuclear Research on the border of France and Switzerland in mid- 1985, Hawking contracted pneumonia, which in his condition was life-threatening; he was so ill that Jane was asked if life support should be terminated.
Split into simpler sentences: During a visit to the European Organisation for Nuclear Research on the border of France and Switzerland in mid- 1985, Hawking contracted pneumonia, which in his condition was life-threatening. He was so ill that Jane was asked if life support should be terminated.