Complex sentence: He briefly served in France during World War II in 1940 and a year later was elected MP for South Dorset, replacing Viscount Cranborne, who was called up to the House of Lords.
Split into simpler sentences: He briefly served in France during World War II in 1940. A year later, he was elected MP for South Dorset, replacing Viscount Cranborne, who was called up to the House of Lords.