Complex sentence: Walter Hallstein (17 November 1901--29 March 1982), a German academic, diplomat, and politician, became the first president of the Commission of the European Economic Community and one of the founding fathers of the European Union.
Split into simpler sentences: Walter Hallstein (17 November 1901--29 March 1982) was a German academic, diplomat, and politician. He was the first president of the Commission of the European Economic Community and one of the founding fathers of the European Union.