Complex sentence: The cactus family itself is believed to have evolved 30-40 million years ago exclusively in North and South America, and areoles signify the family as separate from other succulent plants both in the New World and the Old World.
Split into simpler sentences: The cactus family itself is believed to have evolved 30-40 million years ago exclusively in North and South America. Areoles signify the cactus family as separate from other succulent plants both in the New World and the Old World.