Complex sentence: In order to encourage mating in non-conceptive periods and to encourage males to maintain their proximity, males must possess imperfect knowledge of the female's fertility status, which is achieved through concealed ovulation in most animals that exhibit extended female sexuality.
Split into simpler sentences: In order to encourage mating in non-conceptive periods and to encourage males to maintain their proximity, males must possess imperfect knowledge of the female's fertility status. This is achieved through concealed ovulation in most animals that exhibit extended female sexuality.