Complex sentence: Józef Hieronim Retinger (17 April 188812 June 1960) was a Polish political adviser and a founder of the European Movement that would lead to the founding of the European Union, in addition to that, he created the Bilderberg Group.
Split into simpler sentences: Józef Hieronim Retinger (17 April 188812 June 1960) was a Polish political adviser. He was a founder of the European Movement that would lead to the founding of the European Union and was involved in founding the Bilderberg Group.