Complex sentence: The Hawks play a pivotal role in ending the 100-year war that has ravaged the country of Midland and are initially welcomed as heroes, but Griffith's aspirations to rule his own kingdom are shattered when Guts leaves the Hawks to find his own dream.
Split into simpler sentences: The Hawks play a pivotal role in ending the 100-year war that has ravaged the country of Midland and are initially welcomed as heroes. But Griffith's aspirations to rule his own kingdom are shattered when Guts leaves the Hawks to find his own dream.