Complex sentence: The construction was of iron plates fastened to iron frames, with the central section of the vessel clad with wood secured by iron straps and as built, it was long by in diameter, weighed, and had a crew of 3.
Split into simpler sentences: The construction was of iron plates fastened to iron frames, with the central section of the vessel clad with wood secured by iron straps. As built, it was long by in diameter, weighed, and had a crew of 3.