Complex sentence: The local government of Maitum, Sarangani, Philippines has organized a campaign to save this rare species from extinction which are known to roost in thousands before its decline due to destruction of habitat and reckless hunting.
Split into simpler sentences: The local government of Maitum, Sarangani in the Philippines has organized a campaign to save this rare species from extinction. They were known to roost by the thousands before their decline due to destruction of habitat and reckless hunting.