Complex sentence: Vladimir Katriuk (born 1921) is a Ukrainian immigrant in Canada accused by Simon Wiesenthal Center of allegedly being an active participant in the Khatyn massacre during the Second World War.
Split into simpler sentences: Vladimir Katriuk (born 1921) is a Canadian of Ukrainian ancestry. He is accused by Simon Wiesenthal Center of allegedly being an active participant in the Khatyn massacre during the Second World War.