Complex sentence: León Najnudel (14 July 1941-Buenos Aires-22 April 1998) was an Argentine basketball player and manager, and one of the main proponents of the creation of the Liga Nacional de Básquetbol.
Split into simpler sentences: León Najnudel (14 July 1941-Buenos Aires-22 April 1998) was an Argentinian basketball player and manager. He was one of the main proponents of the creation of the Liga Nacional de Básquetbol.