Complex sentence: Sixty-four were built between 1904 and 1909, with a further two erected in 1915 on the orders of Richard Maunsell which had been ordered and their components built, but not erected earlier.
Split into simpler sentences: Sixty-four were built between 1904 and 1909, with a further two erected in 1915 on the orders of Richard Maunsell. These had been ordered and their components built, but not erected earlier.