Complex sentence: With their home destroyed, the inhabitants then sail to an island that they found to settle down, while Louis becomes a hero among the teenage mammoths, Shira agrees to stay with Diego and becomes a member of the herd.
Split into simpler sentences: With their home destroyed, the inhabitants then sail to an island that they find to settle down. Louis is now regarded as a hero among the teenage mammoths, while Shira agrees to stay with Diego as a member of the herd.