Complex sentence: Her nephew Thomas Perlmann is a professor at the Karolinska Institutet known for his work on the specification and maintenance of dopamine neurons in the brain, and who is also the Secretary General of the Nobel Committee for Physiology or Medicine.
Split into simpler sentences: Her nephew Thomas Perlmann is a professor at the Karolinska Institutet known for his work on the specification and maintenance of dopamine neurons in the brain. He is also the Secretary General of the Nobel Committee for Physiology or Medicine.