Complex sentence: The post was created in 1667 to relieve the Comptroller of the Navy of one of his original duties until 1796 when the Navy Board was restructured: the post of the three Controllers of Accounts were abolished along with the Clerk of the Acts.
Split into simpler sentences: The post was created in 1667 to relieve the Comptroller of the Navy of one of his original duties. It existed until until 1796 when the Navy Board was restructured: the post of the three Controllers of Accounts were abolished along with the Clerk of the Acts.