Complex sentence: During this conference Joostens could gain more experience in the field of international relations under the guidance of delegation leader and well-known disarmement advocate Auguste Beernaert who would win the Nobel Peace Prize in 1909 for his presence at The Hague Conventions.
Split into simpler sentences: During this conference Joostens could gain more experience in the field of international relations under the guidance of delegation leader and well-known disarmement advocate Auguste Beernaert. The latter would even win the Nobel Peace Prize in 1909 for his presence at The Hague Conventions.