Complex sentence: The group known as "sand treaders" are restricted to sand dunes, however, and are adapted to live in this environment; they are active only at night, and spend the day burrowed into the sand, to minimize water loss.
Split into simpler sentences: The group known as "sand treaders" are restricted to sand dunes, however, and are adapted to live in this environment. They are active only at night, and spend the day burrowed into the sand, to minimize water loss.