Complex sentence: Roughly surveyed in 1936 by the British Graham Land Expedition and resurveyed in 1949 by the Falkland Islands Dependencies Survey (FIDS), it was so named by FIDS because of belemnite fossils found there.
Split into simpler sentences: Roughly surveyed in 1936 by the British Graham Land Expedition (BGLE) and resurveyed in 1949 by the Falkland Islands Dependencies Survey (FIDS). So named by FIDS because of belemnite fossils found there.