Complex sentence: The song was first introduced in Super Show 4 on November 19,2011 and then a month later, SM Entertainment announced that Donghae and Eunhyuk would promote the song in several shows like Music Bank, Music Core, Inkigayo, M !
Split into simpler sentences: The song was first introduced in Super Show 4 on November 19,2011. A month later, SM Entertainment announced that Donghae and Eunhyuk would promote the song in several shows like Music Bank, Music Core, Inkigayo, M!