Complex sentence: His father, Vishnu Vasudev Narlikar was an eminent mathematician and general relativist and Professor and Head of the Department of Mathematics at the Banaras Hindu University, Varanasi.
Split into simpler sentences: His father, Vishnu Vasudev Narlikar was an eminent mathematician and general relativist. He was Professor and Head of the Department of Mathematics at the Banaras Hindu University, Varanasi.