Complex sentence: Bazalgette's work ensured that sewage was no longer dumped onto the shores of the Thames and brought an end to the cholera outbreaks; his actions mean he probably saved more lives than any other Victorian official.
Split into simpler sentences: Bazalgette's work ensured sewage was no longer dumped onto the shores of the Thames and brought an end to the cholera outbreaks. His actions probably saved more lives than any other Victorian official.