Complex sentence: They have a battle, and though Misty quickly gained the upper hand and easily defeated Red with her fast and strong Starmie, she is worried that if they do not prepare themselves, Team Rocket will defeat them easily.
Split into simpler sentences: They have a battle, and though Misty quickly gained the upper hand and easily defeated Red with her fast and strong Starmie. However, she is worried that if they do not prepare themselves, Team Rocket will defeat them easily.