Complex sentence: He was frequently mentioned in 2011's' by Erik Larson, the story of the U.S. Ambassador (1933-1937) William E. Dodd and his family in prewar Berlin.
Split into simpler sentences: He was frequently mentioned in 2011's' by Erik Larson. The story of the U.S. Ambassador (1933-1937) William E. Dodd and his family in prewar Berlin.