Complex sentence: Yerba mate is most popular in Uruguay, where people are seen walking on the street carrying the and (thermal vacuum flask) in their arms and where you can find hot water stations to refill the while on the road.
Split into simpler sentences: Yerba mate is most popular in Uruguay, where people are seen walking the streets carrying the and (thermal vacuum flask) in their arms. You can also find hot water stations to refill the while on the road.