Complex sentence: They fought guerrilla warfare in a group dubbed "Pasukan Pangeran Papak" from Markas Besar Gerilya Galunggung (MBGG) led by Major Kosasih, based in Wanaraja, Garut.
Split into simpler sentences: They fought guerrilla warfare in a group dubbed "Pasukan Pangeran Papak", from Markas Besar Gerilya Galunggung (MBGG). They were led by Major Kosasih and based in Wanaraja, Garut.