Complex sentence: Nathu La is located on the 563 km (333 mi) Old Silk Route (an offshoot of the historic Silk Road), connecting Lhasa in Tibet to the plains of Bengal to the south.
Split into simpler sentences: Nathu La is located on the 563 km (333 mi) Old Silk Route, an offshoot of the historic Silk Road. The Old Silk Route connects Lhasa in Tibet to the plains of Bengal to the south.