Complex sentence: The wedding took place in July 1881, the Campbells subsequently took up residence at 79 Cadogan Place in London, and it turned out that Lord Colin did indeed have a venereal disease and had infected Gertrude.
Split into simpler sentences: The wedding took place in July 1881, the Campbells subsequently taking up residence at 79 Cadogan Place in London. It was later discovered that Lord Colin did indeed have a venereal disease and had infected Gertrude.