Complex sentence: Bichkov burned down 30 "holiday homes" that were owned by wealthy Moscow residents, the police would not investigate, naming him the "Russia's Rambo", based on the title character from the Rambo film series.
Split into simpler sentences: Bichkov burned down 30 "holiday homes" that were owned by wealthy Moscow residents. Although the police did not investigate, they did name him "Russia's Rambo", based on the title character from the Rambo film series.