Complex sentence: He learned Polish so he could translate the works of Polish poets like Czesław Miłosz, and English so he could translate John Donne, acquiring a deep interest in classical philosophy, religion, mythology, and English and American poetry.
Split into simpler sentences: He learned Polish so he could translate the works of Polish poets like Czesław Miłosz, and English so he could translate John Donne. On the way, he acquired a deep interest in classical philosophy, religion, mythology, and English and American poetry.