Complex sentence: The one from the 1980s experiences the relatively gentler policing of the "Dixon" TV series whilst the 1950's officer experiences the very harsh policing of the 1980s, represented by a violent parody police procedural called "The Filth".
Split into simpler sentences: The one from the 1980s experiences the soft policing of the "Dixon" TV series. Meanwhile, the one from 1950 experiences the very harsh policing of the 1980s, represented by a parody of violent police procedurals called "The Filth".