Complex sentence: In October 2010, Lovato underwent treatment for "physical and emotional issues," and in April 2011 she confirmed that she would not be returning to "Sonny with a Chance" for its third season.
Split into simpler sentences: In October 2010, Lovato underwent treatment for "physical and emotional issues". In April 2011, Lovato comfirmed, she will not returning to "Sonny with a Chance" for the third season.