Complex sentence: After the mission was over, Katsa was outraged because she found out that Po lied to her and she storms into Raffin's healing center and screams at Po for a long time, then after that, she storms out with tears flowing from her eyes.
Split into simpler sentences: After the mission was over, Katsa was outraged because she found out that Po lied to her. She storms into Raffin's healing center and screams at Po for a long time, then after that, she storms out with tears flowing from her eyes.