Complex sentence: Chagai-I was the result of over two decades of planning and preparation, and its timing was a direct response to India's second nuclear tests, Pokhran-II, also called "Operation Shakti", on 11 and 13 May 1998.
Split into simpler sentences: Chagai-I was the result of over two decades of planning and preparation. Its timing was a direct response to India's second nuclear tests, Pokhran-II, also called "Operation Shakti", on 11 and 13 May 1998.