Complex sentence: Discovered and first indicated on a map by Ludwig Kohl-Larsen during his 1929-30 expedition, the plateau was surveyed and named for its discoverer by the SGS, 1951-52.
Split into simpler sentences: Discovered and first indicated on a map by Ludwig Kohl-Larsen during his 1929-30 expedition. Surveyed and named for its discoverer by the SGS, 1951-52.