Conversation so far:
How would you describe Santiniketan?
Tagore moved to Santiniketan to found an ashram with a marble-floored prayer hall--The Mandir--an experimental school, groves of trees, gardens, a library.
When did he move there?
In 1901.
Was he successful in founding the ashram?
In November 1913, Tagore learned he had won that year's Nobel Prize in Literature: the Swedish Academy appreciated the idealistic--and for Westerners.
Did he have any issues while there?
He was awarded a knighthood by King George V in the 1915 Birthday Honours, but renounced it after the 1919 Jallianwala Bagh massacre.

Question: Why did he renounce it?
Self-contained rewrite: Why did Rabindranath Tagore renounce The Mandir ashram?