Complex sentence: The influence of C. F. W. Ludwig, under whom he studied at Zürich, decided him to devote his attention to physiological chemistry, and therefore he went, after his graduation (1854), to Heidelberg, where R. Bunsen held the chair of chemistry.
Split into simpler sentences: The influence of C. F. W. Ludwig, under whom he studied at Zürich, decided him to devote his attention to physiological chemistry. Therefore, after his graduation (1854), he went to Heidelberg, where R. Bunsen held the chair of chemistry.