Complex sentence: Anime Unleashed (and in turn, all of the series which aired on the block) was canceled in March 2006--leaving "X-Play" the only remaining TechTV show in existence in the United States.
Split into simpler sentences: Anime Unleashed (and in turn, all of the series which aired on the block) was canceled in March 2006. This makes "X-Play" the only remaining TechTV show in existence in the United States.