Complex sentence: Hyeon-su panics and tears of the face mask and sees no one with her and her mother then comes to comfort her and the two share a loving moment before her mother places her face mask into a box in the other room.
Split into simpler sentences: Hyeon-su panics and tears off the face mask, sees no one with her and her mother then comes to comfort her. The two share a loving moment before her mother places her face mask into a box in the other room.