Complex sentence: It obtained the highest audience total for an animated series in the U.S. in 2012, and it was praised by reviewers for its high production values and for addressing difficult sociopolitical issues such as social unrest and terrorism.
Split into simpler sentences: It obtained the highest audience total for an animated series in the United States in 2012. The series was praised by reviewers for its high production values and for addressing difficult sociopolitical issues such as social unrest and terrorism.