Complex sentence: In the late 1970s and 1980s, he worked with Richard Rashke, an American author, to locate and interview Sobibor survivors for the latter's book, "Escape from Sobibor" (1983), about the revolt at the camp.
Split into simpler sentences: In the late 1970s and 1980s, he worked with Richard Rashke, an American author, to locate and interview Sobibor survivors. Rashke wrote "Escape from Sobibor" (1983), about the revolt at the camp.