Complex sentence: They have been known to ascend over up the slopes of the Himalayas, they can withstand and sometimes but they are not adapted to snow and in snow country they must travel along paths made by larger animals or humans.
Split into simpler sentences: They have been known to ascend over up the slopes of the Himalayas, they can withstand temperatures as low as and sometimes. They are not adapted to snow and in snow country they must travel along paths made by larger animals or humans.