Complex sentence: Around 25% of the officers on the Royalist were RN officers on loan or exchange, as were many of the specialist ratings and, the RNZN officers on the cruiser were usually more junior and had lengthy training with the RN in the UK.
Split into simpler sentences: Around 25% of the officers on Royalist were RN officers on loan or exchange, as were many of the specialist ratings. The RNZN officers on the cruiser were usually of junior experience and had lengthy training with the RN in the UK.