Complex sentence: One of the main things that the game was criticised for was the lack of a stand alone dedicated server for the PC version, which the community tried to develop on their own, in hopes that Ubisoft improve on what the community tried to accomplish.
Split into simpler sentences: One of the main things that the community was upset over was the SADS (stand alone dedicated server), which the community tried to develop on their own. The community worked to develop their own SADS in hopes that Ubisoft would make one or improve on what the community tried to accomplish.