Complex sentence: BS 546 is an old British Standard for domestic AC power plugs and sockets.They are also known as type D (for the 5 A 3 pin) and type M (for the 15 A 3 pin) in US documentation.
Split into simpler sentences: BS 546 is an old British Standard for domestic AC power plugs and sockets. These are also known as type D (for the 5-A 3-pin) and type M (for the 15-A 3-pin) in US documentation.