Complex sentence: Bats congregate in night roosts after feeding in the evening which may serve to keep the accumulation of feces away from the day roosts and make the latter less conspicuous to predators.
Split into simpler sentences: Bats congregate in night roosts after feeding in the evening. Thus night roosting could result in the accumulation of feces away from the day roosts which could make the latter less conspicuous to predators.