Complex sentence: Dispatched to Cherkassk for investigation, he met Lukyan Ivanovich Khudiakov, whom he tricked into releasing him, after which he fled to Vetka, a Polish border settlement, with the help of many raskol'niki.
Split into simpler sentences: Dispatched to Cherkassk for investigation, he would meet Lukyan Ivanovich Khudiakov, whom he would trick into releasing him. After which he fled to Vetka, a Polish border settlement, with the help of many raskol'niki.