Complex sentence: The Indian Navy planned to acquire the Su-33 for the its aircraft carrier, the INS "Vikramaditya", the refurbished Soviet "Admiral Gorshkov", which was sold to India in 2004.
Split into simpler sentences: The Indian Navy planned to acquire the Su-33 for the its aircraft carrier, the INS "Vikramaditya". Ironically, the "Vikramaditya" was an adaptation of the Soviet's "Admiral Gorshkov", which was sold to India in 2004.