Complex sentence: Bree, an adventurous and inquisitive colt, grew up in Narnia, but disregarded the warnings of his mother and ventured south past Archenland and into Calormen, where he was enslaved by the Tarkaan Anradin.
Split into simpler sentences: Bree, an adventurous and inquisitive colt, grew up in Narnia. He disregarded the warnings of his mother and ventured south past Archenland and into Calormen, where he was enslaved by the Tarkaan Anradin.