Original sentence: A more obvious external change the fitting of large crane-like davits, each capable of holding six lifeboats.The main changes included the addition one more bulkhead,introduction of a double hull along the engine and boiler rooms and raising six out of the 16 watertight bulkheads up to 'B' Deck
Edited sentence: A more obvious external change was the fitting of large crane-like davits, each capable of holding six lifeboats.The main changes included the introduction of a double hull along the engine and boiler rooms and raising six out of the 15 watertight bulkheads up to 'B' Deck