Complex sentence: Arthur Lewis was born in Castries, Saint Lucia, then still a British territory in the Caribbean, as the fourth of five children of George and Ida Lewis, who had migrated from Antigua shortly after the turn of the century.
Split into simpler sentences: Arthur Lewis was born in Castries, Saint Lucia, then still a British territory in the Caribbean, as the fourth of five children of George and Ida Lewis. His parents had migrated from Antigua shortly after the turn of the century.