Complex sentence: The invention of the flush toilet in the 1840s caused London's sewage system to fail, in 1858 as a result of the summer of The Great Stink and Cholera, Sir Joseph Bazalgette was appointed to redesign London's sewage system.
Split into simpler sentences: The invention of the flush toilet in the 1840s caused London's sewage system to fail. In 1858 as a result of the summer of The Great Stink and Cholera, Sir Joseph Bazalgette was appointed to redesign London's sewage system.