Complex sentence: The only reason people entered woodland near the station at that time of year was to gather wild mushrooms (a popular pastime in Russia), but Chikatilo was not dressed like a typical forest scavenger; he was wearing more formal attire.
Split into simpler sentences: The only reason people entered woodland near the station at that time of year was to gather wild mushrooms (a popular pastime in Russia). Chikatilo, however, was not dressed like a typical forest hiker; he was wearing more formal attire.