Complex sentence: Marine iguanas can dive as deep as, and can spend up to one hour underwater, although most dives are much shorter and near-shore foraging individuals typical only spend about 3 minutes underwater.
Split into simpler sentences: Marine iguanas can dive as deep as, and can spend up to one hour underwater. Most dives are shallower than, and much shorter in duration with near-shore foraging individuals typical only spending about 3 minutes underwater.