Complex sentence: From 1905, Amdrup worked as an Adjutant of Prince Joachim of Denmark, and in 1913, he was appointed to the Greenland Commission (1931: Commission for scientific studies in Greenland), of which he was chairman from 1930 until 1931.
Split into simpler sentences: From 1905, Amdrup worked as an Adjutant of Prince Joachim of Denmark. In 1913, he was appointed to the Greenland Commission (1931: Commission for scientific studies in Greenland), of which he was chairman from 1930 until 1931.