Complex sentence: The Mono Team abandoned development of Moonlight, a free and open-source implementation of both the Silverlight 1 and 2 runtimes, but development has been discontinued in 2012 due to the poor acceptance of Silverlight and restrictions Microsoft imposed on its utility.
Split into simpler sentences: The Mono Team abandoned development of Moonlight, a free and open-source implementation of both the Silverlight 1 and 2 runtimes. The development has been discontinued as of 2012 due to the poor acceptance of Silverlight and restrictions Microsoft imposed on its utility.