Complex sentence: Later, realizing his mistake, Aurangzeb decided to restore the relic to Khwaja Nur-ud-Din Eshai and allow him to take it to Kashmir, but by that point, Khwaja Nur-ud-Din Eshai had already died in imprisonment.
Split into simpler sentences: Later, realizing his mistake, Aurangzeb decided to restore the relic to Khwaja Nur-ud-Din Eshai and allowed him to take it to Kashmir. However, by that point, Khwaja Nur-ud-Din Eshai had already died in imprisonment.