Complex sentence: They identified themselves to be part of the Philippine Constabulary Anti-Narcotics Unit (CANU) with a man by the name of Lt. Arturo Castillo proclaiming himself as the team leader of the raiding party.
Split into simpler sentences: They identified themselves to be part of the Philippine Constabulary Anti-Narcotics Unit (CANU). A man by the name of Lt. Arturo Castillo proclaimed himself as the team leader of the raiding party.