Complex sentence: Liverpool City Police was the police force operating in the city of Liverpool, England from 1836 until 1967 when the forced merged with Bootle Borough Police to create the Liverpool and Bootle Constabulary.
Split into simpler sentences: Liverpool City Police was the police force operating in the city of Liverpool, England, established in 1836. In 1967, the force merged with Bootle Borough Police to create the Liverpool and Bootle Constabulary.