Complex sentence: Additional sheathing added to the hull added about seven tons to her burthen and perhaps fifteen to her displacement, and the ship was one of the first to be fitted with the lightning conductor invented by William Snow Harris.
Split into simpler sentences: Additional sheathing added to the hull added about seven tons to her burthen and perhaps fifteen to her displacement. The ship was one of the first to be fitted with the lightning conductor invented by William Snow Harris.