Complex sentence: Unlike animals that move along the ground, the sugar glider and other gliding species produce fewer, but heavier, offspring per litter, allowing female sugar gliders to retain the ability to glide when pregnant.
Split into simpler sentences: Unlike animals that move along the ground, the sugar glider and other gliding species produce fewer, but heavier, offspring per litter. This allows female sugar gliders to retain the ability to glide when pregnant.