Complex sentence: The Camargue breed was well appreciated by the Celtic and Roman invaders that entered the Iberian Peninsula, and as a result this genealogy is closely tied with Iberian horses, especially those in the northern part of the peninsula.
Split into simpler sentences: The Camargue breed was well appreciated by the Celtic and Roman invaders who entered the Iberian Peninsula. Their genealogy is closely tied with Iberian horses, especially those in the northern part of the peninsula.