Complex sentence: The invention of the flush toilet in the 1840s caused London's sewers to overflow and finally in 1858 following the summer of The Great Stink and outbreaks of 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 sewers to overflow. In 1858 following the summer of The Great Stink and outbreaks of Cholera, Sir Joseph Bazalgette was appointed to redesign London's sewage system.