Complex sentence: The Queen's Police Officer is the descendant of the police first appointed for royal security in 1792 when the Bow Street Runners detective force was appointed by the Magistrates of Bow Street court, and was assigned to provide plain-clothes protection.
Split into simpler sentences: The Queen's Police Officer was the descendant of the police first appointed for royal security in 1792. In that year, the Bow Street Runners detective force was appointed by the Magistrates of Bow Street court, and were assigned to provide plain-clothes protection.