Complex sentence: It was in 1858 that doctor Oliffe, who owned a villa in Trouville, decided to create a "town of pleasure" on the deserted sand dunes and in 1862 the first stone of today's Deauville was laid.
Split into simpler sentences: It was in 1858 that doctor Oliffe, who owned a villa in Trouville, decided to create a town of pleasure on the deserted sand dunes. In 1862 the first stone of today's Deauville was laid.