Complex sentence: However, when remembering all the good times they had, Santa's Little Helper snaps out of his brainwashed state and protects Bart from the dog pack, before returning to the Simpson family, who shower him with love.
Split into simpler sentences: However, when remembering all the good times they had, Santa's Little Helper snaps out of his brainwashed state. The dog then returns to the Simpson family, who shower him with love.