Complex sentence: Alexander Orlov reports in the "Secret History" that Maly disappeared from his post in November 1937 but is contradicted in West's "Crown Jewels", which cites a document that indicates that Maly was still at work on May 23,1938.
Split into simpler sentences: Alexander Orlov reports in the "Secret History" that Maly disappeared from his post in November 1937. This is contradicted in West's "Crown Jewels" where a document is cited that indicates that Maly was still at work on May 23,1938.