Complex sentence: Early in 1967, Learmonth, who was a heavy smoker, was diagnosed with lung cancer; he died at his home in Broughton later that year on 27 September 1967.
Split into simpler sentences: Early in 1967, Learmonth, who was a heavy smoker, was diagnosed with lung cancer. He died at his home in Broughton later that year on 27 September 1967.