Complex sentence: Other detachments of the "Tiger" were sent to rescue the encircled 35 policemen from the Raduša station, but because of the lack of artillery support and the overwhelming numbers of the NLA encirclement, they dug--in at positions outside Raduša.
Split into simpler sentences: Other detachments of the "Tiger" were sent to rescue thirty-five policemen surrounded at the Raduša station. Because of the lack of artillery support, and the overwhelming numbers of the NLA encirclement, they dug--in at positions outside Raduša.