Complex sentence: Similarly, the developers pay no heed to the near-constant requests for a multi-player version of the game; besides the amount of work that would be required to produce one, they doubt that the end result would even be fun.
Split into simpler sentences: Similarly, the developers pay no heed to the near-constant requests for a multi-player version of the game. In addition to the amount of work that would be required to produce one, they don't think that the end result would be fun.