In this article for Princeton Alumni Weekly about Einstein's lecture series at Princeton University in the spring of 1921, the author Joel Achenbach (Washington Post) quotes The Formative Years of Relativity by Hanoch Gutfred and Jürgen Renn to provide insight on the inherent complexity and simplification of the presented theories.

“Neither before nor afterward did he offer a similarly comprehensive exposition that included not only the theory’s technical apparatus but also detailed explanations making his achievement accessible to readers with a certain mathematical knowledge but no prior familiarity with relativity theory.”