Complex sentence: Criticism comes from many sides, including the host countries and other travelers who disagree with the actions of backpackers although the perception of backpackers seems to have improved as backpacking has become more mainstream.
Split into simpler sentences: Criticism comes from many sides, including the host countries and other travelers who disagree with the actions of backpackers. However, the perception of backpackers seems to have improved as backpacking has become more mainstream.