Complex sentence: He continues on a journey of discovery, revelling in this new world, but when he encounters the farmer Jack and his mother, who is troubled by two wherewolf brothers, he finds that he misses the real world.
Split into simpler sentences: He continues on a journey of discovery, revelling in this new world. However, when he encounters the farmer Jack and his mother, who are troubled by two werewolf brothers, he finds that he misses the real world.