Complex sentence: After the downfall of the uprising he was placed in German captivity, after his liberation he became editor of a conspiracy anti-communist periodical "Głos Wolności" ("Voice of Freedom") in Poland under communist rule.
Split into simpler sentences: After the downfall of the uprising he was placed in German captivity. After his liberation Żenczykowski became editor of a conspiracy anti-communist periodical "Głos Wolności" ("Voice of Freedom") in Poland under communist rule.