Complex sentence: David Edward John Frith was born in London on 17 March 1937, before he moved to Sydney in 1948 and returned to England in 1964 at the age of 28.
Split into simpler sentences: David Edward John Frith was born in London on 17 March 1937. He moved to Sydney in 1948 and returned to England in 1964 at the age of 28.