Complex sentence: Upon attaining American citizenship in 1946, the Jose Limón Dance Company had its formal debut at Bennington College and Limón created roles in Doris Humphrey's "Lament" for Ignacio Sanchez Mejias and "The Story of Mankind".
Split into simpler sentences: Upon attaining American citizenship in 1946, José Limón formed the Jose Limón Dance Company. The company had its formal debut at Bennington College, playing such pieces as Doris Humphrey's "Lament" and "The Story of Mankind".