Complex sentence: As of February 2013, there were 77 commissioned ships in the Royal Navy, 13 commissioned ships in the Royal Fleet Auxiliary (RFA) and an additional 6 sealift Merchant Navy vessels available to the RFA under a Private finance initiative.
Split into simpler sentences: As of February 2013, there were 77 commissioned ships in the Royal Navy, 13 commissioned ships in the Royal Fleet Auxiliary (RFA). In addition there are 6 Merchant Navy ships available to the RFA under a Private finance initiative.