Complex sentence: On the Indian side, the pass is east of Gangtok, the capital of Indian state of Sikkim on JN Marg and only citizens of India can visit the pass, that too after obtaining a permit in Gangtok.
Split into simpler sentences: On the Indian side, the pass is east of Gangtok, the capital of Indian state of Sikkim. Only citizens of India can visit the pass, that too after obtaining a permit in Gangtok.