Complex sentence: The Nepalese representatives were given Rs.50,001 as the first instalment, so giving back the territories-Kerung, Kuti, Longa, Jhunga and Falak, they came back to Nepal.
Split into simpler sentences: The Nepalese representatives were given Rs.50,001 as the first installment. So giving back the territories-Kerung, Kuti, Longa, Jhunga and Falak, they went back to Nepal.