Complex sentence: She was finally commissioned on 16 May 1973 into the Royal Navy as HMS Mermaid and after working up, was dispatched to the Far East where she was based in Singapore.
Split into simpler sentences: She was finally commissioned on 16 May 1973 into the Royal Navy as "HMS Mermaid". Purchased by the Royal Navy, she was named HMS Mermaid and after working up, was dispatched to the Far East where she was based in Singapore.