Complex sentence: However, the South Korean government has been hesitant to intervene in the launches by activists due to freedom of expression concerns, although some official actions like banning the use of boats in balloon launching by activists have greatly reduced the amount of leaflets flying into North Korea.
Split into simpler sentences: However, the South Korean government has been hesitant to intervene in the launches by activists due to concerns over freedom of expression. Some actions by officials, however, like banning the use of boats in balloon launches, have greatly reduced the amount of leaflets flying into North Korea.