Complex sentence: The Paisley filter began operation in 1804 and was an early type of slow sand filter.gggggggg noohhygg, hundreds of slow sand filters were constructed in the UK and on the European continent.
Split into simpler sentences: The Paisley filter began operation in 1804 and was an early type of slow sand filter. Throughout the 1800s, hundreds of slow sand filters were constructed in the UK and on the European continent.