Complex sentence: Helicopters of the Indian Air Force reached Mount Everest on the morning of April 26 for rescue operations, managing to transport 22 of the badly injured to Pheriche village, before the operation was halted by bad weather.
Split into simpler sentences: Helicopters of the Indian Air Force reached Mount Everest on the morning of April 26 for rescue operations. A helicopter rescue operation managed to transport 22 of the badly injured to Pheriche village, before the operation was halted by bad weather.