Complex sentence: They formed the first professional police force, the Bow Street Runners, and, through the regular circulation of a'police gazette' containing descriptions of known criminals, Fielding also established the basis for the first police criminal records department.
Split into simpler sentences: They formed the first professional police force, the Bow Street Runners. Through the regular circulation of a'police gazette' containing descriptions of known criminals, Fielding also established the basis for the first police criminal records department.