Complex sentence: Last.fm switched this off on 12 April 2010, which greatly upset some Last.fm users, who partnered instead with third party music services such as Hype Machine, MOG, or Spotify, or subscribed to remote servers, to provide listenable content.
Split into simpler sentences: Last.fm switched this off on 12 April 2010, which greatly upset some Last.fm users. They partnered instead with third party music services such as Hype Machine, MOG, or Spotify, or subscribed to remote servers, to provide listenable content.