Complex sentence: He was frustrated in his efforts to have a more independent unit and became disillusioned by the SA's authority over the SS. On 1 March 1927, he handed over leadership of the SS to his deputy Erhard Heiden.
Split into simpler sentences: He was frustrated in his efforts to have a more independent unit. Berchtold became disillusioned by the subordination of the SS to the SA. On 1 March 1927, he handed over leadership of the SS to his deputy Erhard Heiden.