Complex sentence: Janusz Żurakowski (12 September 1914--9 February 2004) was a Polish fighter and test pilot, who, at various times, lived and worked in Poland, the United Kingdom, and Canada.
Split into simpler sentences: Janusz Żurakowski (12 September 1914--9 February 2004) was a Polish fighter and test pilot. At various times in his life he lived and worked in Poland, the United Kingdom, and Canada.