Complex sentence: Cyril Jackson (5 December 1903--February 1988) was a South African astronomer, born in Ossett, Yorkshire in England, but his father emigrated to South Africa in 1911.
Split into simpler sentences: Cyril Jackson (5 December 1903--February 1988) was a South African astronomer. He was born in Ossett, Yorkshire in England, but his father emigrated to South Africa in 1911.