Complex sentence: The litter size can vary to maximum of eight joeys which is equal to the number of teats, and have a pouch life of 40 days, with the pouch fully encloses the newborn young who are attached to a nipple until they are well developed.
Split into simpler sentences: The litter size can vary to a maximum of eight joeys which is equal to the number of teats. They have a pouch life of 40 days, with the pouch fully enclosing the newborn young who are attached to a nipple until they are well developed.