Complex sentence: Because this eucalypt diet has limited nutritional and caloric content, koalas are largely sedentary and sleep for up to 20 h are asocial animals, and bonding exists only between mothers and dependent offspring.
Split into simpler sentences: Because this eucalypt diet has limited nutritional and caloric content, koalas are largely sedentary and sleep for up to 20 hours a day. They are asocial animals, and bonding exists only between mothers and dependent offspring.