Original: The demonstration was held to demand the release of two popular leaders of the Indian Independence Movement, Satya Pal and Saifuddin Kitchlew, who had been earlier arrested by the government and removed to a secret location.
Simplified: The demonstration was held to demand the release of two popular leaders of the Indian Independence Movement, Satya Pal and Saifuddin Kitchlew, who had been earlier arrested on account of their protests.