Complex sentence: He was the senior American official at the 1944 Bretton Woods conference, and reportedly dominated the conference and imposed his vision of post-war financial institutions over the objections of John Maynard Keynes, the British representative.
Split into simpler sentences: He was the senior American official at the 1944 Bretton Woods conference. He dominated the conference and imposed his vision of post-war financial institutions over the objections of John Maynard Keynes, the British representative.