Complex sentence: According to the French national catalogue, a Dina Dreyfus was active in the 1960s as translator of Hume and Freud, however, Dreyfus is a common name; so the identity is not certain.
Split into simpler sentences: According to the French national catalogue, a Dina Dreyfus was active in the 1960s as translator of Hume and Freud. However, Dreyfus is a common name; so the identity is not certain.