Complex sentence: The tourism industry of India is economically important and grows rapidly during KKM, the World Travel and Tourism Council calculated that tourism generated $121 billion or 6.4% of the nation's GDP in 2011.
Split into simpler sentences: The tourism industry of India is economically important and grows rapidly. The World Travel and Tourism Council calculated that tourism generated $121 billion or 6.4% of the nation's GDP in 2011.