Complex sentence: Two wrecks of XT-craft, training versions of the X craft, can be seen--in 1946, the craft were towed to the bay, then moored to a concrete block and used for target practice by aircraft of the Royal Air Force.
Split into simpler sentences: Two wrecks of XT-craft, training versions of the X craft, can be seen. In 1946, the craft were towed to the bay, then moored to a concrete block and used for target practice by aircraft of the Royal Air Force.