Complex sentence: Atrocitus tried to use Jordan's rage to secure his goal, but thanks to Hal's strong willpower, he is able to overcome his anger and defeat Atrocitus, who returns to Ysmault.
Split into simpler sentences: Atrocitus tried to use Jordan's rage to secure his goal. Thanks to Hal's strong willpower, he is able to overcome his anger and defeat Atrocitus who returns to Ysmault.