Complex sentence: Ekstrand was promoted to commander of the 1st rank in 1936 and was captain of from 1936 to 1937 when he became senior adjutant to His Majesty the King in 1937.
Split into simpler sentences: Ekstrand was promoted to commander of the 1st rank in 1936 and was captain of from 1936 to 1937. He became senior adjutant to His Majesty the King in 1937.