Complex sentence: The Prescott Channel was built in 1930 as part as flood relief for the River Lee Navigation in the East End of London, and was named after Major Prescott, a former chairman of the Lee Conservancy.
Split into simpler sentences: The Prescott Channel was built in 1930 as part as flood relief for the River Lee Navigation in the East End of London. The channel was named after Major Prescott, a former chairman of the Lee Conservancy.