Complex sentence: In the book, Kahan made a series of claims about Kaganovich's working relationship with Joseph Stalin and his activities during the Ukrainian famine, and claimed to be the long-lost nephew of Kaganovich.
Split into simpler sentences: In the book, Kahan made a series of claims about Kaganovich's working relationship with Joseph Stalin and his activities during the Ukrainian famine. He also claimed to be the long-lost nephew of Kaganovich.