Complex sentence: Queneau spent much of his life working for the Gallimard publishing house, where he began as a reader in 1938, rose to be general secretary, and eventually became director of l’Encyclopédie de la Pléiade in 1956.
Split into simpler sentences: Queneau spent much of his life working for the Gallimard publishing house, where he began as a reader in 1938. He later rose to be general secretary, and eventually became director of l’Encyclopédie de la Pléiade in 1956.