Complex sentence: As Rapunzel runs into the royal maze she remembers the magic painting of the tower and trick Gothel into running into it--which Hugo reminds her she can't escape as she has a lying heart.
Split into simpler sentences: As Rapunzel runs into the royal maze she remembers the magic painting of the tower and tricks Gothel into running into it. She finds herself in Rapunzel's tower, which Hugo reminds her she can't escape as she has a lying heart.