Complex sentence: Localised predators include Eleonora's Falcon in the Columbretes Islands and the nocturnal Barn Owl in the Balearics; a few owls can wipe out a colony.
Split into simpler sentences: Localised predators include Eleonora's Falcon in the Columbretes Islands and the nocturnal Barn Owl in the Balearics. A few owls can wipe out a colony.