Complex sentence: In 1889, Dent and Douglas Freshfield led an expedition to search the area; although they were unable to find any remains, they did discover a bivouac at around on the Ullu-auz pass between two glaciers.
Split into simpler sentences: In 1889, Dent and Douglas Freshfield led an expedition to search the area. Although they were unable to find any remains, they did discover a bivouac at around on the Ullu-auz pass between two glaciers.