Complex sentence: Belgarion was born in Sendaria, in a small stonecutter's town called Annath, in the mountains, where the major industry was mining granite and slate, and passed into the protection of his aunt, Polgara after his parents were murdered by the Grolim Chamdar.
Split into simpler sentences: Belgarion was born in Sendaria, in a small stonecutter's town called Annath. Annath is in the mountains and the major industry is quarrying granite and slate, but passed into the protection of his Aunt Polgara after his parents were murdered by the Grolim Chamdar.