Complex sentence: Other themes of the film are Cloud's feelings of guilt and regret for not being able to save his friends Zack and Aerith which are symbolized through a grey wolf that appears in scenes in which Cloud thinks about them.
Split into simpler sentences: Other themes of the film are Cloud's feelings of guilt and regret for not being able to save his friends Zack and Aerith. These feelings are symbolized by a grey wolf that appears in scenes where Cloud thinks about them.