Complex sentence: Abanindranath Tagore was born in Jorasanko, Kolkata to Gunendranath Tagore who is the son of Girindranath who is again the second son of Prince' Dwarkanath Tagore.
Split into simpler sentences: Abanindranath Tagore was born in Jorasanko, Kolkata to Gunendranath Tagore. His grandfather was Girindranath Tagore, the second son of Prince' Dwarkanath Tagore.